Acrobat's garment (7)
I believe the answer is:
leotard
'acrobat's garment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for leotard that I've seen before include "Skin-tight garment worn by acrobats" , "Dancers might wear this" , "Dance/exercise garment" , "Dancer's tight-fitting garment" , "Acrobat costume" .)