You will find more info about Gi uniform on IBJJS website

https://ibjjf.com/uniform

You can download an example picute of Gi uniform here

Your gi have to be clean and undamaged. Only the color white, blue (royal blue) and black is allowed. Your Gi jacket and pants have to be of the same color.

You must wear undergarment.

Men are not allowed to wear rashguard or tights. Women are allowed to.

Your belt must be undamaged and not have any discolorations. The ends of the belt must be at least 20 cm from the knot.