Summerween Costume Ideas?

I need ideas for a costume for a summerween event coming up 😭 it can be cosplays or anything and it can be male or female characters, if possible pls pls recommend ones that have matches LOL 

ALSO it needs to be outfits that can be in 100° weather please I do not wanna roast and die LMFAO

uhhhhhhhh John McLane from die hard? man its just to put on a dirty undershirt n some black pants and walk around with a water gun (but aslo you can't forget the watch)

I went as a jellyfish for summerween last year if this helps p(^^)q I thought it sort of fit, its a costume & it fits for summer. It is very cute too.

Cosmic Boy from that 40s Superboy comic that had a printing mistake, it's one of the best costume for 100°F