Tool
Which size does this chart put me in?
There's no standard behind the number on a dress label, so the only chart that answers for a dress is the one on its own product page. Paste that chart in, and this works out what it says about you.
Fit finder
Step 1
Your measurements
Taken over the undergarments you'll wear with the dress. How to measure
These stay in this browser. They're never sent anywhere. What that means
Saved on this device.
Step 2
The chart you're looking at
Copy the size chart from the product page and paste it below — one size per line, with its bust, waist and hip numbers. We don't keep a copy of anyone's chart, so use the one that governs the dress in front of you.
Result
What this chart says
The rule it uses
Take the smallest size whose bust, waist and hip numbers all meet or exceed yours — the "order for your largest measurement" convention makers themselves instruct. It works in one direction only: a dress can be taken in, and can rarely be let out.
If your three measurements point at three different sizes, that's ordinary. Bodies aren't proportioned the way a size chart's grading assumes, and the gap is what alterations exist to close.