How to Fix your Gi pants string the easy way. - YouTube
Meerkatsu's Blog: Gi Review: TUFF Fightwear Lightweight BJJ Kimono
Better way to tie your gi pants? Knot stays tied better! : r/bjj
GKR Karate - Tying the belt ('obi' in Japanese, pronounced o-bee) is for decorative purpose and may hold the jacket together a bit but does not help holding the pants up. LOL