>>32788659Most of the main female characters (Leaf, May, Dawn, Hilda, Moon, etc.) wear relatively light clothing (i.e. tank tops, shorts/skirts) so you probably won’t have to worry about melting in the sun if you go with one of those looks.
If you want to dress as a male character, Gold/Ethan and Brendan (ORAS) wear long shorts as opposed to pants. You could also look into different trainer classes, though these won’t be as iconic.
Villain teams may also be looking into, I know a lot of people enjoy messing around as Team Skull.