How to Measure Yourself for Online Shopping (So You Never Guess Your Size Again)
A five-minute guide that saves you from three-quarters of online sizing disasters.
By Neha Agarwal, Founder of PriMoha · 17 August 2026 · 2 min read
Most online sizing mistakes don't come from an unusual body — they come from shopping by size label ("I'm usually a Large") instead of by actual measurement. Size labels don't mean the same thing across brands, or even across two collections from the same brand. Measurements do. Here's how to take yours properly, once, and reuse them everywhere.
What you need
- A soft measuring tape (the flexible kind, not a metal tape measure)
- Fitted clothing or light undergarments — loose clothes will throw off every number
- Five minutes and, ideally, someone to help with the back measurements
The three measurements that matter most
- Bust: Wrap the tape around the fullest part of your chest, keeping it parallel to the floor all the way around. Don't pull it tight — snug, not compressed.
- Waist: Measure around your natural waist, typically just above your navel, at the narrowest point when you're standing relaxed (not sucked in).
- Hip: Measure around the fullest part of your hips and seat, roughly 7–9 inches below your natural waist for most body shapes.
Stand naturally for all three. Held-in or pushed-out posture changes the numbers enough to throw off a size recommendation.
Why this beats guessing by label every time
Once you have real numbers, you can check them against any brand's actual size chart (in inches or cm) rather than trusting whatever they call "Large." This single habit eliminates most of the guesswork that leads to returns — and it's the same underlying data that fit-recommendation tools, including PriMoha's Universal Fit Engine, use to suggest a size instead of asking you to interpret a label.
A tip for irregular measurements
If your bust, waist and hip don't sit in the same "size" on a standard chart, size to your largest relevant measurement for the garment type (bust for tops, hip for bottoms) and expect to alter elsewhere if needed — that's a fit issue, not a you issue, and it's exactly the gap that body-shape-diverse sizing systems are trying to close.
Keep it somewhere you'll find it
Save your three numbers in your phone notes. Update them roughly once a year, or after any significant change in your body. You'll never have to guess a size from a label again.