Crease some simple attire (5)
I believe the answer is:
pleat
'crease' is the definition.
(I know that pleat is a type of crease)
'some simple attire' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'PLEAT' is hidden within 'simple attire'.
(Other definitions for pleat that I've seen before include "that's tailor-made" , "Fold formed in fabric" , "Gathering" , "Crease" , "Leapt (anag)" .)