derek guy Profile picture
Mar 28, 2023 24 tweets 13 min read Read on X
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. A man in a frock coatMen in suits.
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. Duke Ellington in a flannel...Humphrey Bogart in a tweed ...
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. Yukio Akamine in a tan lien...Michael Hill in an olive co...Sid Mashburn in a Air Force...Yasuto Kamoshita in a seers...
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).  Navy nailhead suit in Holl...Close up of the navy fabricHarrisons Mystique grey nai...Close up of the grey worste...
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. Matt Gaetz in a suit jacket...
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. Wes Anderson in a corduroy ...Peter O'Toole in a corduroy...
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. A grey worsted wool suitA close up of the grey wors...A brown tweedA close up of the brown tweed
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. Nailhead worsted wool with ...A man in a chalkstripe flan...
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) Taupe glen check tweed spor...Grey glen check suitClose up of the grey glen c...
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) Man in a brown linen double...Tweed sport coat with jette...Man in a tweed sport coat w...Tweed sport coat with patch...
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 George Santos in a grey sui...
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: Graph showing the schoolboy...
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 Boating blazersBoating blazersBoating blazersBoating blazers
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. Brass button navy blazerBrass button navy blazer
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: Blazer buttons with various...Brass blazer buttons
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. A man in a navy sport coat,...
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. A man in a navy blazer and ...
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. An orphaned suit jacket. Yo...An orphaned suit jacket. Yo...
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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