Lounging attire (4)
I believe the answer is:
robe
'lounging attire' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for robe that I've seen before include "Gown, rich dress" , "Loose garment for Boer" , "Gown or dress of office" , "judge's garment" , "Formal attire" .)