How to Measure for a Suit (What's My Suit Size?) | The Black Tux Blog
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Guides How to Measure for a Suit (What's My Suit Size?)
When it comes to formal wear, your fit is everything, which means it's critical to get your suit sizes right. Don’t sabotage your look by taking the wrong measurements.
Last updated: June 17, 2025Copy Link
Perhaps you’re renting the traditional brick-and-mortar way, and trying to decide whether to learn how to measure for a suit yourself, or trek to the mall to have your inner thigh measured by a surly sales associate. Or maybe you’re buying or [renting a suit online](/content/collections/suit-and-tuxedo-rentals "Suit and Tuxedo Rentals by The Black Tux"/index.html). In either case, you wouldn’t be the first person to find themselves stymied in the suit shopping process, standing in front of a full-length mirror asking yourself “What is my suit size? And who am I, really?” We can’t help you with the second part of your literal self-reflection, but we can help you find the suit size you need.
The good news is you may not actually need to measure for a suit at all. We'll cover all the basics, from “How should a suit fit?" or "How should a tux fit?” and answer the tedious question of “How do I measure for a tux?” We've obsessed over this stuff for years so you can get the perfect suit sizes in minutes.
Table of Contents
Before You Measure
How to Find My Size
Understanding Suit Sizes
Before you find your fit and measure for a suit, there are a few things you should understand about how to read suit sizes. Without getting deep in the weeds, let’s bring you up to speed.
Jacket Chest Size
The size label on a suit jacket will include a number—typically between 34 and 52—and a letter or two. The numbers are the chest size of the jacket (not to be confused with your chest measurement, which is different—more on that later), and usually they’re offered in even sizes.
Jacket Length
Jackets typically come in short (S), regular (R), and long (L) lengths, although some brands offer extra short (XS) and extra long (XL) lengths as well. Usually, these lengths correspond with your overall height.
Waist Sizes and Pant Inseam Length
Typically, the first number on a label for dress pants or denim is the waist size, while the second is the length size (AKA the inseam). When it comes to suit pants, you’ll sometimes be provided only with a waist size. That’s because with traditional suiting, you’ll have the pants hemmed to your desired length. More often than not, waist sizes are offered in even sizing (32, 34, 36, etc.). If various inseam lengths are offered, they’ll typically be even suit pant sizes as well.
Casual Clothing vs. Formal Wear
If your go-to jeans are a size 32 waist, you’d probably assume you wear the same size in suit pants, but that’s rarely the case. Casual clothing, like denim and chinos, typically have a little more stretch in the waist. That means your suit pants, which have less give, will likely need to be a larger size.
Similarly, the fabrics used for suit pants don’t bunch up as easily as casual fabrics. That means your 32 length jeans fit shorter than their size. When you try on a 32 length pair of suit pants, you’ll probably find them to be too long.
To recap: Suit pants fit tighter and longer than casual pants in the same size.
Brand to Brand Size Differences
While big differences in sizing from brand to brand are unusual, sizing can vary—think +/- a size or length. Your favorite suit jacket might be (for example) a 38L and fit you perfectly, but a 38L in another brand could be too tight or too short. This shouldn’t stop you from shopping a variety of brands, but it’s important to keep it in mind if you shop online—ordering the tag size may not equate to an identical fit. This also means a sales associate (or online size predictor) could provide a sizing recommendation that differs from what you’d normally expect.
Go back to Table of Contents
How Should a Suit Fit?
The fit of your suit really comes down to personal preference. If it helps, think about the fit of a suit like you’d think about eggs: not everyone loves them the same way, so unless you specify, you might get scrambled when you’re expecting sunny side up.
However, there are still a few things in this world almost everyone can agree on. So how should a suit jacket fit? What about the pants? We get these questions a lot, and thought it'd be better to show you than explain it.
How is my jacket supposed to fit? - YouTube
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How is my jacket supposed to fit? The Black Tux
The Black Tux2.74K subscribers
How are my pants supposed to fit? - YouTube
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How are my pants supposed to fit? The Black Tux
The Black Tux2.74K subscribers
Differences Between Suit Fits & Cuts
Each brand will interpret suit fit or "cut" types in different ways, but generally, there are some assumptions you can make about classic, regular, slim, and skinny fits.
Classic Fit or Regular Fit
A “classic” fit will be more generous in size overall. Rather than having a contoured cut, you’ll find the waist of the jacket and leg of the pants to have a pretty even cut without much tapering. This fit had its heyday in the ’80s and ’90s, but some brands offer a modern version of the classic fit that’s just a little more generous in the seat and thigh of the pants, and in the arms of the jacket. You can expect the same from a “regular” fit.
Skinny Fit
A “skinny” fit is probably going to mean what you think it means: it will contour your body closely. This probably isn’t a great fit if you’re planning on... I don’t know, doing the YMCA or entering a limbo contest? That’s because this fit won’t leave you with much extra fabric (literally no wiggle room) in the jacket or pants. But if you’re going for a model-in-a-magazine look, skinny fit probably checks all the boxes. Just don’t plan on lifting any boxes.
Slim Fit
A “slim” fit offers the best of both worlds: a contoured cut that looks great with enough room to comfortably move and dance, ideally. It’s also timeless, so a very safe choice for fit type if you’re purchasing a suit. The jacket will have a slightly tapered waist to give shape to your silhouette, and the arm holes will neither feel baggy nor constrict your movement. Plus, the leg of the pant will taper down to your shoe, creating a slimming effect. Below is a good example of slim fit suiting.
[Sterling Grey Suit by The Black Tux ➝](/content/collections/suits/products/sterling-grey-suit "Buy the Sterling Grey Suit by The Black Tux"/index.html)
A Note on Atypical Body Types
Every body type is beautiful (except mine) and unique, but some of us are so unique that it becomes difficult to wear the most accessible brands. If you have a super-athletic build, a tall and thin frame, or you're shorter with a broad build, you’ll likely get the best results from custom, tailor-made garments. But that can get expensive, and off-the-rack is a non-starter. Instead, buy or rent suit (or tuxedo) separates, and talk to your tailor about the best ways to adjust the fit of the garments you own.
Custom Suiting vs. Off-the-Rack Sizes
When you buy a suit off the rack, you’re buying a suit with a “standard drop”—the difference between the chest size of your jacket minus the waist size of your pant. The standard drop is 6, which means if you wear a size 38 jacket, the pants will be a size 32 waist (38 - 32 = 6). Unfortunately, not everyone fits neatly into this standard drop. If that’s you, consider having a garment custom made, shop for (or rent) separates, or plan on taking your off-the-rack garment to a tailor for fine-tuning.
What can a tailor adjust?
First, are you renting or buying? If you rent a suit, you’ll probably be limited to temporary sleeve length or pant length hem adjustments. If you own the suit, you have more options, but there are some parts of a suit you shouldn’t touch.
Do not take your suit in for these alterations:
→ Jacket Shoulders
→ Jacket Chest
→ Jacket Body Length
If the suit seems to be your size but something’s just a little off:
→ Jacket Sleeve Length
→ Pant Length Hem
→ Jacket Waist
→ Pant Waist
→ Pant Taper
When in doubt, ask your tailor what’s realistic, and manage your expectations accordingly.
Go back to Table of Contents
How to Find My Size
[Visit The Black Tux Showroom ➝](/content/pages/showrooms "Book an appointment at The Black Tux showroom store"/index.html)
Try On Suits In a Store
Good old trial and error. Trying on suit separates is a great way to get a ballpark estimate of your suit sizes. Make sure you’re wearing a dress shirt and dress shoes, and try on as many jackets and pants as you need until you find the right fit. While this method still requires you to head into a store, you probably don't need to [book a fitting](/content/pages/showrooms "Book a fitting at The Black Tux showroom"/index.html) or ask an associate to take your measurements.
Pay attention to whether the garment that fits you best is a slim or classic fit. While the definition of these terms can vary from brand to brand ( see our breakdown above), it still helps to know if the size 38 suit jacket you tried on was designed with a tailored fit or a relaxed fit.
Finally, make sure to write down (or email yourself) the sizes—jacket chest size, jacket length, pant waist size, and inseam length if applicable.
No suit stores near you? We'll send you a [free home try-on](/content/collections/home-try-on "Get a free home try-on from The Black Tux"/index.html) so you can find your suit size wherever you are.
[Get a Free Home Try-On ➝](/content/collections/home-try-on "Home Try-On from The Black Tux"/index.html)
Go back to Table of Contents
How to Measure Yourself for a Suit
We know what you’re about to say—something along the lines of “I’ll mess it up and end up with a bad fit.” This would be a valid concern, but what you may not realize is that the days of asking a friend to measure you for a suit are numbered. Proprietary fit and sizing technology has come a long way, making it easier than ever to find your suit sizes.
Finding Suit Sizes with Fit Technology
Up until about 10 years ago, getting measured for a suit was a rite of passage—as was lining up outside a department store with a belly full of carbs in hopes of scoring a $75 TV. The point is, we've come a long way from those times. Neither measuring yourself at home nor visiting the first tailor or menswear store a quick search serves up to get your measurements taken always results in a great fit, so we pioneered a new approach.
We ask simple questions that most people know the answers to: their height, weight, age, body shape, and shoe size. If you have fit preferences or know your formal wear sizes (your shirt size, for example), we’ll use that, too. Then, we compare your data to hundreds of thousands of customers like you to calculate your perfect fit.
Think of it as the modern tape measure—something anyone can use to find the right size. Check out any suit [on our site](/content/collections/suits "Suits by The Black Tux"/index.html) to try it out now, for free.
How to Measure for a Suit Using a Tape Measure
You’ll need accuracy if you’re using a tape measure to measure for a suit. These are the most common measurements you’ll need to take and how to take them.
Need a tape measure? Grab one here.
Neck Measurement Measure around the fullest part of your neck, but don’t measure too tightly—a finger or two should fit between the measuring tape and your neck.
Shoulder Measurement Wearing a shirt that fits you well helps with this measurement, as you're pretty much just measuring the distance between armhole seams across your back.
Sleeve Measurement Keeping your shoulders relaxed and arms down at your sides, hold the measuring tape at the edge of your shoulder, at the armhole. Measure straight down to the wrist, just where it meets your hand.
Chest Underarm Measurement Wrap the measuring tape under your arms, measuring around the widest part of your chest. As tempting as it is, don’t puff out your chest or flex.
Chest Overarm Measurement Measure around the widest part of your chest, but this time, wrap the tape measure all the way around your arms. Again, try to stay relaxed for this measurement.
Waist Wrap the measuring tape around your waist, just above your hips, where dress pants would normally sit. If you’re wearing jeans or casual pants, aim for just above the waist of the pant, but don’t go over the top, where a belt would sit.
Outseam Measurement Measure from the top of your waistband, straight down to the ground. You can either subtract 1"-2" from the total measurement, or eyeball the spot where your pants hit your shoe. If you tend to wear your pants with a larger break (more pant fabric gathered on the shoe), just subtract 1"-2" from the total waist-to-floor measurement.
Inseam Measurement First, wear pants that fit you well, without a lot of loose fabric. Then, measure the inside seam of your pant leg, from the highest point to the edge of your dress shoes. Don’t measure to the end of the pants you’re wearing
Most suiting brands won't request an inseam measurement, but they'll usually take one during a fitting.
As you take your measurements, keep in mind that these raw numbers don’t always translate into garment sizes. For example, your waist measurement may be 33”, but that doesn’t mean you’re a size 33 waist.
Go back to Table of Contents
How to Have Measurements Taken for a Suit
If you’ve ever rented a suit from a traditional tux shop, you probably have a very specific and possibly traumatic memory of getting measured for a suit. While it’s probably not something you’ll journal about over a glass of cabernet, there are benefits to stopping into a store.
If you’re not confident in your ability to measure yourself or aren't fully on board with fit tech, you should absolutely visit a store. Whenever possible, go to the same store you’re buying or renting from. Having your measurements taken someplace else will often lead to mixed results and disgruntled commissioned sales associates.
Quick Tips for Getting Fitted
- Always wear a dress shirt and dress shoes to get fitted.
Without over-explaining, this is all about precision. Flip flops and t-shirts aren’t the same.
Communicate your preferred fit (or bring a photo). We each have our own definition of what looks good and fits correctly. Speak up so the pro’s can dial it in for you. Not sure how to describe your preference? Save a photo of someone wearing a suit the way you like it.
Don’t argue with the pros. If they’re making a recommendation that doesn't fully align with what you want, it's fine to ask them why. Maybe they know something about the fit of their suits that you don’t. Just know that they want you to look good.
Suits by The Black Tux
Learning how to measure for a suit or tuxedo can be a hassle, but more importantly, it’s not always reliable. That's why we make it easy to find your suit sizes by [visiting us in person](/content/pages/showrooms "Visit The Black Tux Showroom"/index.html), finding your sizes entirely online, or [getting a free home try-on](/content/collections/home-try-on "Get a Free Home Try-On from The Black Tux"/index.html). Using a combination of data science, machine learning, and good-old-fashioned formal wear expertise, we realized that the best way to measure for a suit doesn’t require a tape measure.
[Find Your Fit Now ➝](/content/pages/fit-survey "Take The Black Tux Fit Survey to Find Your Sizes"/index.html)
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