You are standing in the fitting room with a coat on, not sure if it is too big or just right. This is the most common question when buying outerwear, and the only one that truly determines whether the coat gets used or ends up hanging in the closet.
A coat should fit differently than a blazer. It is worn over other garments, it must allow for movement, and it still needs to maintain a clear silhouette. In this guide, we walk through where the shoulder seam should sit, how to measure sleeve length, which length suits your height, how to try on a coat correctly, and the five signs that you have the wrong size.
Contents
- The shoulder determines everything
- How to measure sleeve length
- Space for what you wear underneath
- Which length suits you?
- How to try on a coat correctly
- Five signs of the wrong size
- Our current favorites
- Frequently asked questions
- Summary
The shoulder determines everything
Always start at the shoulder. The shoulder seam should land on the outer edge of your shoulder, right where the arm begins to curve downward—not on top of the shoulder muscle and not partway down the upper arm. If the seam is positioned correctly, the rest of the coat will hang correctly on its own.
There is one exception, and it is an important one: an oversize coat is designed with the shoulder seam intentionally dropped. It should sit off the shoulder—but equally on both sides and by no more than a few centimeters. An oversize model in the wrong size doesn’t feel oversize; it feels borrowed.
The shoulder is also the only measurement a tailor cannot easily alter. Trousers can be hemmed, sleeves can be shortened, the waist can be taken in—but the shoulder width is not something you redo. If the shoulder fits but nothing else does: buy it and alter the rest. If everything fits except the shoulder: wrong size, regardless of how good it looks from the front.
How to measure sleeve length
The sleeve should end at the wrist, where the hand begins, when you stand with your arms hanging down. Then, reach your arms forward as if you are holding a steering wheel: the sleeve may pull up a bit, but it should never expose more than a hand's width of your forearm.
If the coat is to be worn over a blazer or a thick knitted sweater, you need a centimeter or two of extra room—otherwise, the blazer sleeve will peek out from under the coat sleeve. This is the most common reason why a coat that fit perfectly in the store suddenly feels short in November.
Space for what you wear underneath
A coat is not measured against your body; it is measured against your winter wardrobe. Bring the thickest items you will actually wear underneath when trying it on—in practice, a chunky knit sweater or a blazer.
The test is simple: button the coat completely and cross your arms in front of your chest. If it feels tight across the back or the buttons pull apart at the bust, the coat is too small. If you can simultaneously pinch a couple of centimeters of fabric at the side, you have the right fit.
If you plan to wear multiple layers, it is worth reading our guide on layering first—how you build your layers affects the size you need in outerwear.
Which length suits you?
The length is determined more by your height and what you wear underneath than by fashion. Benchmarks that work:
| Length | Ends at | Best suited for |
|---|---|---|
| Short coat | The hip | Shorter height, and over dresses or skirts |
| Mid-length | Mid-thigh | The most versatile length—works over everything |
| Knee-length | Just above or at the knee | Suit trousers, the office, colder days |
| Maxi | The calf or ankle | Taller height, and true winter |
Two things to keep in mind. If you are under 165 cm, a knee-length coat divides the body in half—choose a mid-length coat or ensure the coat is worn open with a slim silhouette. And if you are wearing a dress underneath, the coat should either be shorter than the dress or longer than it, never ending just a centimeter away from the hem. More on that in our guide on wearing a coat with a dress.
How to try on a coat correctly
Four movements, in that order, in front of the mirror:
- Stand still and look at the shoulder seam. If it's wrong here—start over with a different size.
- Button it completely and exhale. No pulling at the button, no ripples in the fabric.
- Reach forward with both arms. The sleeve may slide up, but the back should not feel tight.
- Walk a few steps and sit down. A coat that only works while standing is not the right coat.
Also, check the collar from behind: it should lie flat against your neck without any gap. A gap there usually means the coat is too large in the back, even if the shoulders seem to fit.
Five signs of the wrong size
Signs that the coat is too small: the buttoning pulls and forms an X across the bust, the shoulder seam is sitting on top of the shoulder instead of at the edge, and you cannot cross your arms.
Signs that it is too large: the shoulder seam hangs down onto the upper arm, the collar gaps away from your neck, and the belt has to be pulled tight just to give the coat any shape at all.
The fifth sign applies to both directions and is the one that really matters: you think about the coat while you are wearing it. A coat that fits properly is one you stop noticing after ten meters.
Material plays a role here. A wool blend has some give and will mold to you over time; a tightly woven, water-resistant fabric does not, so the fit must be right from the start. If you want to compare the warmth of different materials, we have our own guide on which material is warmest.
Our current favorites
Three coats where fit is what they do best:
- Black long coat with classic collar – tailored in the shoulder, the model we measure others against.
- Classic trench coat with button closure – straight fit with room for a sweater underneath, where the belt defines the silhouette.
- Short double-breasted coat in luxury fabric – hip-length, for those for whom a knee-length coat makes them look shorter.
The belt determines whether a warm coat looks tailored or boxy. Tie it simply for everyday wear, through the buckle for work, and on the back when wearing the coat open—you can find five knots step-by-step and which placement suits your figure in the guide coat with a belt.
A hood changes what a coat can handle. It replaces the umbrella on windy days and a hat on mild ones, but it also makes the garment more casual, so the model and fabric matter more than on a coat with a classic collar. We walk through which models are available and how they are worn in women's coat with hood.
Frequently asked questions
Should you take a size larger in a coat?
Only if you have tried your usual size with a thick sweater underneath and it felt tight. Coats are usually already sized to be worn over other clothing—going up a size "just in case" results in a coat without a silhouette.
Where should the shoulder seam sit on a coat?
On the outer edge of the shoulder, where the arm begins to curve downward. The exception is oversize models, where the seam is intentionally dropped a few centimeters—equally on both sides.
How long should a coat be?
Mid-length, to the middle of the thigh, is the most versatile length. If you are under 165 cm, knee-length can often be dividing; if you are taller, you can wear maxi length without issue.
How do I know if the coat is too big?
The collar gaps from the neck, the shoulder seam hangs onto the upper arm, and the coat only takes shape when the belt is pulled tight. All three at once means going down a size.
Can a tailor alter a coat?
Sleeve length, hem length, and the waist can be altered. Shoulder width is generally not something that can be changed. Therefore, let the shoulder determine the size and alter the rest.
Should the coat be longer than the dress?
Either clearly shorter or clearly longer. Ending a few centimeters from the dress's hem is the only look that feels wrong.
Summary
Let the shoulder determine the size—it is the only measurement that cannot be altered. The sleeve should end at the wrist, with a little extra if you are wearing a blazer underneath, and you should be able to button the coat completely and cross your arms over the thickest clothing you actually wear. Mid-length is the length that works for the most occasions. And the surest test of all: if the coat fits properly, you stop thinking about it.
Ready to try? Explore our women's jackets and read our guide on women's coats.
Looking for something else? See all our 143 guides in a list.
