A garment that will withstand wear? That's my forte (6,4)
I believe the answer is:
strong suit
'forte' is the definition.
(I've seen this in another clue)
'a garment that will withstand wear? that's my' is the wordplay.
I cannot really see how this works, but
'garment' could be 'suit' (suit is a kind of garment) and 'suit' is found in the answer.
The remaining letters 'strong' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for strong suit that I've seen before include "Something at which one excels" , "special talent" .)