Dress has a quiet pearl ensemble (7)
I believe the answer is:
apparel
'dress' is the definition.
(synonyms)
'a quiet pearl ensemble' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'ensemble' indicates an anagram.
'pearl' is an anagram of 'parel'.
'a'+'p'+'parel'='APPAREL'
'has' acts as a link.
(Other definitions for apparel that I've seen before include "Garb, clothes" , "Fancy gear" , "formal dress?" , "Attire" , "Clothes - garments" .)