How To · Fashion · Everyday
Measure yourself properly for online shopping
Online shopping requires precision—but not obsession. We'll walk you through the five measurements that actually matter, taken the way brands measure their samples.
5 min read · IrisThe gap between online fit disasters and perfect purchases often comes down to one thing: how you measured. Most people either skip measurements entirely or take them so loosely that the data becomes useless. Brands measure their samples on dress forms with specific tension—neither strangling the tape nor letting it hang slack.
This guide covers the five measurements that unlock better online shopping: bust, waist, hips, inseam, and shoulder width. You'll need a soft measuring tape (fabric, not metal), a mirror, and ten minutes. No experience required.
Measure over the clothes you'll actually wear under the garment—not bare skin, not a puffy sweater.
What you'll need.
- 01Soft measuring tape (fabric, not metal)
- 02Mirror
- 03Fitted undergarments and base layers
- 04Pen and paper or digital notes
- 05Shoes you'll wear with the garment (for inseam)
Step one · 2 minutes
Gather your tools and dress appropriately
Find a soft measuring tape (dollar stores and fabric shops stock them). Put on the undergarments and bra you'd wear with the clothes you're buying—this changes measurements by up to an inch. Stand in front of a mirror so you can see the tape isn't twisted. Wear fitted basics like a tank top and leggings, not loose layers.
If you don't own a soft measuring tape, use a piece of string, mark the length with a pen, then measure the string against a ruler.
Step two · 1 minute
Measure your bust
Wrap the tape around the fullest part of your chest, keeping it parallel to the ground. The tape should sit snugly but not compress your chest—you should be able to slip one finger underneath. Stand naturally; don't puff out your chest or cave inward. This measurement determines how a shirt, dress, or jacket will fit across your torso.
Take the measurement at the end of an exhale, not while holding your breath.
Step three · 1 minute
Measure your waist and hips
For waist, find the narrowest point between your ribs and hips—usually around your belly button—and wrap the tape horizontally. Keep one finger's worth of slack. For hips, measure around the fullest part of your rear and thighs, again with light tension. Both measurements should feel comfortable, not restrictive. Many online retailers list both because they indicate different silhouettes.
Measure your waist while standing, not sitting. Sitting compresses your midsection and gives false numbers.
Step four · 2 minutes
Measure your inseam
This is the length from your inner thigh to your ankle—the most critical measurement for pants. Wear the shoes and socks you'd pair with those pants. Stand with feet hip-width apart. Have someone measure from your crotch seam down to the top of your shoe, or use a mirror and measure from the inside of your thigh to your ankle bone. Write down this number; it's your baseline for all trouser lengths.
Inseam changes based on shoe heel height. Measure separately for flats versus heels if you're buying multiple styles.
Step five · 2 minutes
Measure shoulder width
This one's trickier but essential for jackets and structured tops. Measure from the top of one shoulder bone to the top of the other, across the back. The tape should sit at the natural shoulder point where your arm begins, not at your neck. This measurement tells you whether a jacket will sit properly or gap at the sides.
If you're unsure where your shoulder point is, wear a fitted t-shirt and look in the mirror. The seam should sit right at the top of your shoulder.
Step six · 2 minutes
Record and compare to size charts
Write your five measurements down. Before buying anything online, check the brand's size chart and compare your numbers to their listed measurements for each size. Brands vary wildly—a medium at one retailer might be a large at another. Always prioritize the actual measurements over the size label. Bookmark size charts for brands you buy from regularly.
Create a simple spreadsheet with your measurements and favorite brands' size charts. Update it once a year or if your body changes.
How to know your measurements are accurate
Good measurements feel comfortable when you take them—not tight, not loose. When you receive an online purchase and compare it to your measurements and the size chart, the garment should fit as predicted. If it doesn't, the issue is usually the brand's inconsistency, not your measuring.
Questions at the mirror.
What if I'm between two sizes on the size chart?
Check the specific garment's reviews or description. If it runs small, size up. If it runs large, size down. When in doubt, choose the size that matches your bust measurement—that's the hardest dimension to alter.
Do I need to measure myself every time I shop?
No. Your measurements stay relatively stable unless your body changes. Remeasure once a year or after significant weight fluctuations. Keep a record so you can reference it.
My measurements don't match any single size. What do I do?
This is normal. Prioritize the measurement for the garment type: bust for tops and dresses, waist and hips for pants, shoulder width for jackets. Read reviews to see how that style fits across different body types.
Should I measure myself or have someone else do it?
Either works, but consistency matters more. If you measure yourself, use a mirror. If someone helps, make sure they keep the tape level and snug but not tight. Stick with the same method each time.