Crossword Genius

Dress in unfashionable suit (6)

Ross

I believe the answer is:

outfit

'dress' is the definition.
(outfit is a kind of dress)

'unfashionable suit' is the wordplay.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'suit' becomes 'fit' ('fit' can be a synonym of 'suit'**).
'out'+'fit'='OUTFIT'

'in' is the link.

(Other definitions for outfit that I've seen before include "Kit, rig-out" , "Complete set of clothes" , "Business" , "what to wear?" , "suit" .)

I've seen this clue in The Telegraph.
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