More suited by unfashionable tailor (9)
I believe the answer is:
outfitter
'tailor' is the definition.
(I've seen this before)
'more suited by unfashionable' is the wordplay.
'more suited' becomes 'fitter' ('fit' can be similar in meaning to 'suited').
'by' means one lot of letters go next to another.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'fitter' after 'out' is 'OUTFITTER'.
(Other definitions for outfitter that I've seen before include "Tailor" , "Clothier" , "Men's clothing shop" , "One supplies gear" , "Seller of clothes" .)