To me, those floral mini-loincloths seem very sexy, and serve to draw attention to what they're concealing - which the crowd in the Colosseum, and everyone here, knows perfectly well anyway! I think there is some Classical evidence for otherwise naked women in the arena for whatever purposes being adorned with flowery mini-garments - dancers certainly would have been, but dressing even those destined to die in that way might have been a kind of mockery - though, as I've often said, Romans may not have been much bothered about the girls feeling ashamed, but they do seem to have had a superstitious fear that seeing female genitals would cause themselves some harm.