Matched uniform to tops, leggings, evening dress (8)
I believe the answer is:
equalled
'matched' is the definition.
(I've seen this before)
'uniform to tops leggings evening dress' is the wordplay.
'uniform' becomes 'equal' (I've seen this before**).
'to tops' suggests taking the first letters.
The initial letters of 'leggings evening dress' is 'led'.
'equal'+'led'='EQUALLED'
(Other definitions for equalled that I've seen before include "In three parts; voice" , "Matched, rivalled" , "Came to" .)