Skimpy garment (5)
I believe the answer is:
thong
'skimpy garment' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for thong that I've seen before include "Narrow strip of leather (or other material)" , "(Very) brief knickers" , "flip-flop" , "Strip of leather used for fastening" , "Insubstantial underwear" .)