Underwear made from artificial fibres? (6)

I believe the answer is:
briefs
'underwear' is the definition.
(I've seen this before)
'from artificial fibres?' is the wordplay.
'fibres' can be anagrammed to 'BRIEFS'.
Though, I'm not sure how this is indicated.
'made' is the link.
Can you help me to learn more?
(Other definitions for briefs that I've seen before include "Underwear and lawyer's documents" , "Digests" , "by which privates will be constrained" , "Gives information and instructions (to)" , "Underpants for a lawyer" .)
