Some garments are rubbish! (5)
I believe the answer is:
pants
'are rubbish' is the definition.
(informal term meaning poor-quality)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pants that I've seen before include "Undergarments; rubbish" , "boxers?" , "See 17" , "What you get from a hot dog" , "Briefs" .)