Reference

Gear

The uniform and what you wear to train.

Gi: Training uniform
Gi is the uniform worn for Judo. Coaches often use the word when talking about grips, sleeves, and lapels.
Judogi: Judo uniform
The judogi is the full Judo uniform: jacket, trousers, and belt. It is built to withstand heavy gripping and throwing.
Uwagi: Jacket
The uwagi is the jacket of the judogi. Its strong lapels and sleeves are where most grips are taken.
Zubon: Trousers
The zubon are the trousers of the judogi. They are reinforced to handle kneeling, groundwork, and leg grips.
Obi: Belt
Obi means belt. Coaches may use obi when talking about tying, rank, or competition belt colors.