Still fashion designs about right for formal wear (7,5)
I believe the answer is:
evening dress
'formal wear' is the definition.
(I've seen this before)
'still fashion designs about right' is the wordplay.
'still' becomes 'even' ('even' can be a synonym of 'still'**).
'fashion' is an anagram indicator.
'about' says to put letters next to each other.
'right' becomes 'r' (common abbreviation).
'designs' after 'r' is 'rdesigns'.
'rdesigns' is an anagram of 'ingdress'.
'even'+'ingdress'='EVENING-DRESS'
'for' acts as a link.
(Other definitions for evening dress that I've seen before include "DJ" , "Formal dinner wear" , "Formal attire" .)