The person behind GI Size
Robert Morley
Brazilian jiu-jitsu black belt
Academy: Beyond Black Belt
Location: Burton-on-Trent, United Kingdom
Training: More than 12 years on the mats
Lineage: Carlos Gracie Jr. → Braulio Estima → Victor Estima → Kev Ayre
Why this exists
Better information makes better choices.
GI Size grew from a practical problem: gi labels are inconsistent, and a size that fits in one brand may not fit in another. This project brings official brand charts into one clear reference so people can compare a gi they know with one they are considering.
“I have tapped more times than any white belt.”View my Beltchecker profile ↗
Gi or no-gi
Mostly gi
A practical bias toward the garment this project measures.
The goal
Less guesswork
Clear charts, traceable sources, and honest gaps where data is missing.
Help improve it
Share a chart
Brands can publish machine-readable sizing so everyone can read it accurately. Download templates.