See-through clothing
See-through clothing is any sort of garment made of non-opaque material. Latex clothing can easily be designed to be see-through. Obviously, this allows people to see the wearer's skin almost as if he or she were naked or scantily clad. The wearer may have lingerie underneath to avoid being indecent.
A skirt or dress may have its lowest part see-through, thereby showing more of the thighs than its length would otherwise allow.
Even apparently opaque clothing may allow some see-through. For example, a white blouse may be sufficiently see-through to allow a black bra underneath to be detectable.
Cut-out
A cut-out is a large hole deliberately cut in a piece of clothing to reveal the wearer's bare flesh underneath. The commonest place for a cut-out is over the breasts to emphasise cleavage.