Riding breeches (8)
I believe the answer is:
jodhpurs
'riding breeches' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for jodhpurs that I've seen before include "Riding attire" , "Long riding breeches" , "Flared trousers worn with riding boots" , "Horse-riding trousers" , "Trousers for horseback riders" .)