Not tacky, at all. It should be encouraged. I once went to an outdoor food establishment by the beach, and I was the only one eating my food bare chested. Doesn’t make sense why others weren’t enjoying this privilege, as well.
@AAAmax That's great man. Probably less awkward at outside based beach restaurant but one shouldn't care I guess. Would be awesome if it was the normal to see shirtless guys on any establishment esp on warm nights.