The stuff that I would wear would be the same things I already have. That is because of a few reasons.
The First reason is because I alredy have it, so it would be less expensive.
The other reason is because I am a chemist and the clothing i already wear is considered safe.
The final reason is that it would prevent me from walking around naked witch except for a few people I wouldn't want to see them doing that and I expect other people wouldn't want to see me do that. Additionally I imagine the questions explanation might sound something like this "If people didn't care what you are wearing(assuming that you have cloths on) what would you wear?"
It would be exceptionally uncomfortable if a bunch of guys weren't wearing any thing at all and were somewhere public.