Draped garment to hang loosely around Master Weasley? (6)

I believe the answer is:

sarong

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'draped garment' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(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" .)

I've seen this clue in The Times.

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