Smarter clothing item voguish? That is right (8)
I believe the answer is:
brainier
'smarter' is the definition.
(I've seen this before)
'clothing item voguish? that is right' is the wordplay.
'clothing item' becomes 'bra' (I've seen this in another clue).
'voguish?' becomes 'in'.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'right' becomes 'r' (common abbreviation).
'bra'+'in'+'ie'+'r'='BRAINIER'
(Other definitions for brainier that I've seen before include "With a higher IQ?" , "more clever!" , "More intelligent (colloq.)" , "appearing brighter" , "smarter" .)