One-piece ballet garments (8)
I believe the answer is:
leotards
'one-piece ballet garments' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for leotards that I've seen before include "One-piece ballet garments" , "One-piece garments for dancing and exercise" , "Garments for gymnasts" , "Theatrical attire" , "Clothing for acrobats" .)