Piece of clothing that means a good deal (3)
I believe the answer is:
lot
'a good deal' is the definition.
(a good deal of something)
'piece of clothing that' is the wordplay.
'piece of' indicates the answer is hidden within the clue.
'LOT' can be found hidden inside 'clothing that'.
'means' is the link.
(Other definitions for lot that I've seen before include "Auction item, great deal" , "Parcel - collection" , "Great deal; destiny" , "Large amount - parcel of land" , "shower" .)