Diamonds, for example, that you can wear (4)
I believe the answer is:
suit
I believe this is a double definition.
'diamonds for example' is the first definition.
(a playing cards suit)
'that you can wear' is the second definition.
(suit is a type of clothing)
(Other definitions for suit that I've seen before include "Hearts, maybe" , "Set of clothes for legal action" , "See 10" , "clubs maybe?" , "Go well with; clothing" .)