A coat should fit with the shoulder seam sitting right at the edge of your shoulder, sleeves ending at your wrist bone (or just past it), and enough room through the body to button it over a sweater without pulling. If you can hug yourself, reach forward and lift your arms without the back feeling tight, the coat fits.
That's the short version. Below is how to check each part in a mirror, what changes when you plan to wear it over thick knits, and how to pick a size when you're shopping online.
Start With the Shoulders
Shoulders are the one part of a coat that's hard to change, so check them first. The seam where the sleeve joins the body should land on the outer edge of your shoulder bone. If it sits up on top of your shoulder, the coat is too small and will pull across your back. If it hangs down onto your upper arm, the coat is too big, and the whole thing will look a little slumped.
The exception is a coat that's meant to be relaxed or oversized. Those are cut with a dropped shoulder on purpose, so a seam that sits a bit lower is part of the design. What you're watching for is whether it looks intentional or just big.
Check the Sleeve Length
With your arms down at your sides, the sleeve should cover your wrist bone and stop around the base of your thumb. That's long enough to keep your wrists warm and leave room for a sweater cuff to tuck inside, but not so long that it swallows your hands.
Then reach your arms straight out in front of you. The sleeves will ride up a little, which is normal. If they jump up past your wrists and leave a gap of bare arm, they're too short for winter wear.
Leave Room for What's Underneath
This is where most coats go wrong. A coat that fits perfectly over a T-shirt in the fitting room can feel tight in January when you're wearing a chunky knit under it. So try coats on over the thickest layer you'll actually wear with them.
Once it's buttoned or zipped, you should be able to slide a flat hand between the coat and your chest without the front straining. Look for pulling lines that spread out from the buttons in an X shape. Those mean it's too snug. A little ease through the body is what lets a coat look smooth instead of stretched.
A clean, structured coat like the Suit-Collar Tailored Coat should skim over a sweater without clinging. It also comes in sizes XS to 5XL, which makes it easier to find the size that fits your shoulders and your layers at the same time.
Do the Movement Test
Standing still in a mirror only tells you half the story. Before you decide, move around in the coat:
- Hug yourself. If the back feels tight across your shoulder blades, it's too small.
- Reach forward like you're grabbing a steering wheel. The coat shouldn't pull hard at the armpits.
- Lift your arms overhead. Some lift at the hem is fine; the whole coat riding up to your waist isn't.
- Sit down. A longer coat should still let you sit without the buttons straining over your hips.
If it passes all four, you've got a coat you'll actually be comfortable in for a full day, not just a photo.
Pick a Length That Works for Your Life
Length is more about how you dress than a rule. A hip-length coat or jacket is easy for driving and running errands, and it pairs well with jeans and boots. A mid-length coat that hits around the knee covers dresses and skirts and feels a bit more put-together. A long coat gives you the most warmth and a polished, head-to-toe line.
The Relaxed Mid-Length Coat is a good example of the in-between option. It has a relaxed fit and a length that layers cleanly over knits and dresses, so it works for most of the cold season.
Slim, Regular or Relaxed?
The fit label on a coat tells you a lot about how much room you'll have:
- Slim coats are cut close to the body. They look sleek, but leave less space for bulky sweaters, so many people size up if they layer heavily. The Faux-Fur Collar Winter Coat has a slim fit made to keep you warm without swallowing your frame.
- Regular coats sit in the middle. They have enough room for a sweater and still keep a clean shape. The Tailored Padded Coat is regular fit and padded for warmth, but cut tailored so it doesn't look puffy.
- Relaxed or loose coats are roomy by design. They're the easiest choice if you want to wear your chunkiest knits underneath.
How to Choose Your Size Online
When you can't try a coat on, measure instead. Grab a coat you already love, lay it flat, and measure straight across the chest from armpit to armpit, then from the shoulder seam to the cuff. Compare those numbers to the size guide rather than going by the size on the tag of an old coat.
Also read the product details. All of the coats linked above note that they run small and suggest sizing up if you're between sizes. That's worth paying attention to, especially if you plan to wear thick layers underneath.
Quick Answers
How should a coat fit in the shoulders? The shoulder seam should sit at the edge of your shoulder bone. Too far in means it's too small; drooping down your arm means it's too big, unless the coat is designed with a dropped shoulder.
How should a coat fit a woman in winter? Size it for your thickest layers. Try it on over a heavy sweater, button it up, and make sure the front lies flat and you can still reach and lift your arms comfortably.
How should a jacket fit compared to a coat? A jacket can fit a little closer because it usually goes over thinner layers. A winter coat needs more room through the chest and arms so it fits over sweaters.
Ready to find one that fits? Browse all of our Jackets & Coats.
