Concealment and Promise
Clothing can be a concealment offering the promise of nudity. It utilizes the aesthetic appeal for the sexual appeal, such that the sartorial decoration becomes an extension of the physical beauty. It calls the imagination for aid by denying the direct vision of bare actuality. Conceal enough, however, and the promise is suffocated.
This play of concealment and possibility is a function of the context. To see a possibility where it is not offered is to risk being guilty of sexual objectification.