Loose flowing garments (5)
I believe the answer is:
robes
'loose flowing garments' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for robes that I've seen before include "Sober (anag)" , "Attire" , "trappings of office?" , "'The 19 across 1 across' of the French Revolution" , "Official vestments" .)