Emmy, there was a long discussion with multiple users including you as to what would complement bottomless, and naked_shirt was the chosen tag. Let us not just arbitrarily change tag definitions that were approved in this forum, (including by you), without a proper discussion in this forum. BTW Flandre93 recommended that tag. Bottomless also suggests something very very deep, why we settled on naked_shirt

As for buruma, which aliases to bloomers, these typically are made of nylon or polyester and would work quite well as swimwear if worn without underwear. For men they are typically called a speedo and look just like a typical female buruma. This was the swimwear I wore while part of a swim club for several years in my youth and would be a reasonable substitute for bikini_bottom which we currently do not support. We can discuss changing that if you want. But we must discuss it in this forum.

Topless does mean that a girl is not wearing anything from the waist up. she may have her back to the viewer, but her breasts are definitely exposed. even google agrees with that definition.