Draped garment to hang loosely around Master Weasley? (6)
I believe the answer is:
sarong
'draped garment' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sarong that I've seen before include "Groans about Malayan skirt-like garment" , "SE Asian garment" , "Wrapped dress or skirt" , "Unisex Malayan garment of cloth wrapped around body" , "Tropical skirt" .)