Spring fashion garment (4,4)
I believe the answer is:
jump suit
'garment' is the definition.
(I know that jump suit is a type of garment)
'spring fashion' is the wordplay.
'spring' becomes 'jump' (synonyms).
'fashion' becomes 'suit'.
'jump'+'suit'='JUMP SUIT'
(Other definitions for jump suit that I've seen before include "Combined trousers and jacket or shirt" , "All-in-one garment" , "It may be put on" , "Paratrooper's garment" , "(Para's) one-piece garment" .)