Post-shower wear (4)
I believe the answer is:
robe
'post-shower wear' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for robe that I've seen before include "official dress" , "Loose or formal garment" , "Any loose flowing garment" , "Clobber" , "Loose garment for Boer" .)