WHAT'S THE DIFFERENCE BETWEEN A SUIT JACKET, SPORT COAT, AND BLAZER?
A friend of mine recently emailed me to ask whether he accidentally bought a suit jacket by mistake, when he wanted a sport coat. I see this sort of thing happen often, so let's break down the differences 🧵
First, understand that a suit is just a garment where the jacket and pants have been cut from the same cloth. This distinguishes it from the frock coat, which is what "proper" gentlemen wore before suits became popular.
By the early 20th-cent, the frock coat fell out of favor and was replaced by suits and sport coats.
See how the suit on the left is made to be worn with matching pants. The sport coat on the right is made to be worn with pants cut from a different cloth.
A suit can be made from almost anything: cotton, linen, seersucker, thornproof tweed, cavalry twill, etc.
It can also come in any color, although it's most traditionally made in sedate colors, such as various shades and hues of blue, grey, brown, and green.
When you go into a store, however, you will mostly see suits like these. These are made from worsted wool, which is a smooth, often slightly silky, sometimes slightly shiny fabric (fabric nerds please don't "actually" me about worsted—I have character limits).
The reason why you want to know the difference between a suit jacket and sport coat is bc you never want to dress like Gaetz below. You don't want to look like you accidentally spilled something on your suit pants and changed out of them. The jacket here is too formal for pants.
But remember, some suits can be broken into separates! Corduroy is a perfect example. If you have a corduroy suit, you can easily wear the jacket with matching corduroy pants or pants cut from a diff fabric. Corduroy works a suit or sport coat.
So, how do you know when you can wear a suit jacket on its own?
Clothing is a social language, so much of this is about training your eye for what looks right, just as you would train your ear to know what sounds right. However, I can give you some guidelines:
Generally speaking, the rougher, fluffier, and more visible the weave, the more likely you’re looking at a sport coat. Conversely, the finer and flatter the weave, the more likely you’re looking at a suit jacket.
Silky worsted wool? Suit
Tweed? Sport coat.
Certain patterns can also be clues. Pinstripes and chalkstripes always indicate something was meant to be worn as a suit. Fine patterns or weaves, such as birdseye, nailhead, and small-scale herringbones, also tend to be reserved for suits.
Scale of pattern also matters. Although suits can come in big, bold patterns, and sport coats in quiet and subtle ones, the more successful sport coats tend to have larger scale designs. It’s a way of saying, "this isn’t something to be worn to a business meeting."
Look at these two coats. They are both made with the same pattern: a glen check. They even have similar colors. But the sport coat has a much larger scale pattern, which distinguishes it as more casual than the suit jacket (which should only be worn with matching pants)
Some other details can be a giveaway. Patch pockets, leather-wrapped buttons, and fewer than four buttons at the sleeve are all casualizing details. Jetted pockets, on the other hand, are typically reserved for suits (although not always)
This can all sound overwhelming at first. But you can avoid the worst by sticking to a simple rule:
Don't wear navy, grey, or black jackets made from silky, smooth wools on their own. Esp if they have flapped or jetted pockets. These are suit jackets and need matching suit pants
Ok, now, what's a blazer? I've seen lots of people here mistake suit jackets and sport coats as blazers.
Here is the long history of blazers encapsulated in a neat little chart:
One definition comes from the history of club blazers, where people wore unusually striped or trimmed jackets to distinguish themselves as members of a rowing, boating, or yachting club. Jack Carlson's book Rowing Blazers is dedicated to this subject. The style is VERY preppy
The other definition comes from the history of schoolboy blazers, which were also sometimes a distinguishing feature of club blazers. These are essentially navy sport coats with metal buttons (silver or gold in color). The buttons sometimes have emblems of the organization.
It's very rare to see boating blazers nowadays out in the wild. When people (correctly) use the term blazer nowadays, they mean a navy sport coat made with buttons that look like this:
If you like tailored clothing, a navy sport coat is the most useful garment you can own. Start with that in a slightly textured material to distinguish it from navy suit jackets. Hopsack, serge, and Mock Leno all work.
You can have a tailor swap out the buttons to play with different looks: matte brown horn for year-round wear, mother of pearl for summer (only for summer materials like Mock Leno), or brass buttons for something slightly preppy.
Sales associates at good stores should be able to guide you on what's what. If you are shopping vintage, beware of things called "orphaned suit jackets." These are suit jackets sold without matching pants (usually bc the pants wore out at the seat). Avoid these purchases.
One more thing: if you're on TikTok, you've prob seen this clip of Harvey claiming you can turn 5 suits into 75 different outfits. Lots of men remix this audio with a video showing them doing this. I don't want to put anyone on blast by posting their vid. But you can look them up
The reason why you can't do this is bc not all suit jackets can be worn on their own (see Gaetz and Santos above). Your ability to wear a suit jacket on its own depends on whether it can *convincingly* pass as a sport coat.
This depends on a host of variables: fabric's sheen, texture, and weave; pattern type and scale; jacket details such as pocket style, etc. The details matter greatly, so don't mix and match willy-nilly as Harvey recommends.
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Style lessons from Robert Redford, one of the most stylish men in the last century. 🧵
A tailored jacket continues to be one of the most flattering things you can wear. However, for it to look good, it has to fit right. That means a jacket that bisects you halfway from your collar to the floor when you're in heeled shoes. Also trouser + suit jacket silhouette flows
It also helps to know how to use this visual language, especially with regard to ideas about formality. For instance, a dark business suit cries out for a tie. If you don't want to wear a tie, try a more casual garment, like a sport coat.
Let's start with a test. Here are two tan polo coats. One is machine-made. The other is handmade. Can you guess which is which?
Please answer before moving on. Then you can scroll through the answers to see whether most people got it right.
The first coat is machine-made. It's from an American ready-to-wear company called J. Press. The second is handmade. It's from a London bespoke tailoring house called Anderson & Sheppard.
You can spot the difference by how the edges are finished.
I've seen people here suggest Obama was a stylish president. I couldn't disagree more. Outfits like these read better in 2025, but during the slim-fit, Euro style craze of his presidency, Obama was routinely panned for his "frumpy dad style." See Vanity Fair.
His style transformation really came post-presidency. I suspect, but don't have proof, that this is partly the influence of his wife, who is quite stylish. Even his suits look better now. See clean shoulder line + shirt collar points reaching lapels + nice four-in-hand dimple.
Although it's rarely expressed in outright terms, people often use a very simple heuristic when solving fashion problems: they wish to look rich, which is often disguised as "respectable."
I will show you why this rarely leads to good outfits. 🧵
In 1902, German sociologist Georg Simmel neatly summed up fashion in an essay titled "On Fashion." Fashion, he asserted was simply a game of imitation in which people copy their "social betters." This causes the upper classes to move on, so as to distinguish themselves.
He was right. And his theory explains why Edward VIII, the Duke of Windsor, was the most influential menswear figure in the early 20th century. By virtue of his position and taste, he popularized soft collars, belted trousers, cuffs, Fair Isle sweaters, and all sorts of things.
It's funny to see people imbue traditional men's tailoring with their own prejudices. They assume every man who wore a suit in the far past must be a staunch conservative like them. The truth is much more complicated. 🧵
This bias, of course, stems out of the 1960s and 70s, from which many of our contemporary politics also spring. I don't need to belabor this point because you already know it. The framing is neatly summed up in this Mad Men scene — the rag tag hippie vs man in a suit.
Thus, people assume that men in suits must always be part of the conservative establishment. But this was not always so. The suit was once a working man's garment. When Keir Hardie, founder of the Labour Party, arrived for his first day in Parliament, he wore a suit.
There's no "right" or "wrong" answer here, so feel free to go with your gut. I will then give you my views below. 🧵
In men's tailoring, the area below the jacket's buttoning point is colloquially known as the "quarters" among menswear enthusiasts. Or the "front edge" by actual tailors. These terms refer to the edge of the coat, connecting to lapels.
Some suit jackets have very closed quarters, such as you see on the left. In this way, the jacket forms a Y-shaped silhouette.
Other suits have open quarters, such that the front edge sweeps back on the hips, as you see on the right. This forms an X-shaped silhouette.