The criteria I used for these rankings are based on 3 things:
1. How unique/recognizable are the fighter’s shorts?
If you see the shorts, you know who’s wearing them.
2. Have they been wearing them consistently for an extended period of time?
Have they been wearing the same colored or themed shorts for many years?
3. How visually appealing the are the shorts?
This is somewhat at my personal digression, but I will try to be as unbiased as possible.