Also a weird thing DBGT (And end of Z) Really suffer from 90s Ites so many Characters wear Jeans or other Casual Clothes Goku is really the Only one with a Gi at that time!
I mean, is it really that much of an issue? The non-fighting characters in the original Dragon Ball run (that didn't live in villages) dressed like they were from the 80s. It's not like it's era inappropriate with that context.