Trimming favored by Marie Antoinette (5)
I believe the answer is:
sable
'trimming favored by marie antoinette' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sable that I've seen before include "Bales of valuable Russian fur" , "Black; antelope" , "fur coat" , "Dark brown fur of the marten" , "Fur - heraldic black" .)