I'll just break the silence a bit.
I like the aviator Pyro concept, I feel like there can be something to work with especially with many of the head replacements in the game almost resembling a fighter pilot face mask. But there's not much going on here and makes the Pyro look like a day job worker with the collar shirt.
I don't expect you guys to work on this any further than you want to, just saying that I like it and there's room for improvement, take care.

(No means to be a buzzkill but doesn't spacesuit cosmetic kinda fill this role already?)

Also, have you considered instead of going for the polygonal circle approach for the buckle, to instead just make it angular and industrial, like retro military manufactured equipment?

Is there a faint hint of camo on it & if there is can you make it more noticable? Also will there be a matching bottoms for this?