Stylish and posh, favourite clothing brand (8)

I believe the answer is:

up-market

(Other definitions for up-market that I've seen before include "Quality, prestige (commodities)" , "Towards the more expensive end of goods" , "Appropriate for affluent people" , "High in price or prestige" , "Towards more expensive tastes" .)

I've seen this clue in The Guardian.

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