Coarse stuff from males (7)
I believe the answer is:
buckram
'coarse stuff' is the definition.
(type of coarse linen)
I can't explain the rest of the clue.
(Other definitions for buckram that I've seen before include "stiffening" , "Coarse stiffened cloth" , "stiff stuff!" , "Coarse cotton fabric stiffened with glue" , "Coarse stuff" .)