How To · Fashion · Build
Find Your Coat Size Across Any Brand
Coat sizing varies wildly between brands—a size 8 at one house might be a 10 at another. Here's how to decode the mystery and order with confidence.
5 min read · IrisCoat sizing is not standardized. A petite trench at J.Crew fits nothing like a structured wool coat from COS or a relaxed overshirt from Everlane. Brands cut differently, grade their sizes inconsistently, and sometimes ignore conventional sizing altogether. This is especially true across price points and geographic markets.
The solution isn't to memorize your size at every retailer—it's to know your actual measurements and understand how each brand interprets them. Once you have that data, ordering online becomes predictable, and returns drop dramatically.
Your shoulder width is the one measurement that rarely lies. Use it as your anchor point.
What you'll need.
- 01Soft measuring tape
- 02Paper and pen (or notes app)
- 03Brand size charts (downloaded or screenshotted)
- 04A well-fitting coat or jacket you already own
- 05Product photos and descriptions
Step one · 1 minute
Measure yourself in a fitted garment you already love
Put on a coat or jacket that fits you perfectly across the shoulders, chest, and length. Lay it flat on a table and measure from shoulder seam to shoulder seam (this is your shoulder width). Measure across the fullest part of the bust, the waist, and the hip. Note the total length from the back of the neck to the hem. Write these numbers down—they're your baseline.
Use a soft measuring tape, not a ruler. Measure twice to avoid errors.
Step two · 2 minutes
Check the brand's size chart before you look at the size label
Every brand publishes a size chart—usually hidden under 'Size Guide' or 'Fit Information.' Download or screenshot it. Look for shoulder width, bust, and length measurements for each size. Compare your measurements to the chart. You may be a size 6 in one brand and a size 10 in another. This is normal and not a reflection of your body.
If a brand offers multiple fits (slim, regular, relaxed), pull all three charts. Some brands list fit differently for petite or tall versions.
Step three · 2 minutes
Account for the coat's intended silhouette
A tailored wool coat should skim your body; an oversized blazer or boyfriend coat is meant to drape. Read the product description and look at the fit photos. If the model is drowning in it, that's intentional. If the description says 'fitted' or 'tailored,' your bust measurement should align closely with the size chart. For relaxed or oversized cuts, you can size down slightly—but verify this in the size chart, not in your head.
Check the lining description too. Unlined coats sit differently than fully lined ones and may feel slimmer.
Step four · 2 minutes
Read customer reviews for fit feedback, not for sizing validation
Customer reviews can tell you if a coat runs small, large, or true to size—but only in aggregate. One person saying 'I'm usually a 6 and sized up to an 8' doesn't mean you should do the same. Instead, look for patterns: 'Runs small across the shoulders' or 'The length is generous.' Cross-reference these observations with the size chart. A review that says 'I'm 5'2" and the length hit my ankles' is useful data if you're also petite.
Ignore reviews that focus on personal style preferences ('too boring,' 'not trendy'). You want fit feedback only.
Step five · 1 minute
Make your decision and order with a clear return plan
Based on the size chart and your measurements, select the size that matches your shoulder width and bust most closely. If you're between sizes, choose based on the coat's intended fit: go smaller for tailored, larger for relaxed. Place your order. Most retailers offer free returns within 30 days—use this window to confirm the fit in person before committing.
If a brand offers free returns, order two sizes and return the one that doesn't fit. This removes guesswork entirely.
How to know it works.
The right coat size sits smoothly across your shoulders with the seam landing at the edge of your shoulder bone. The front buttons or wraps without pulling or gaping. You can move your arms freely without the coat riding up. The length hits where the brand intended—check the product photos to confirm.
Questions at the mirror.
What if I'm between two sizes on the chart?
Prioritize the shoulder width—it's the hardest measurement to alter. If your bust falls between sizes, choose based on the coat's silhouette. For tailored coats, go smaller; for relaxed or oversized, go larger. The chest can be accommodated by layering or tailoring more easily than shoulder width.
Should I size up if I plan to layer?
Only slightly, and only if the size chart shows you're already close to the upper end of a size. A coat should fit over a light sweater without pulling. If you need to layer heavily, consider a relaxed or oversized fit from the start—don't just size up in a tailored coat.
Why does the same brand fit differently in different styles?
Different factories, different designers, different construction methods. A wool coat and a trench from the same brand may grade their sizes completely differently. Always check the size chart for each specific item, not just the brand.
What if the size chart measurements don't match the product photos?
Trust the numbers over the photos. Photos are styled and shot on models of varying heights and builds. The size chart is your objective truth. If they conflict, contact customer service before ordering.