Opposite of casual (6)

I believe the answer is:

dressy

(Other definitions for dressy that I've seen before include "'Stylish, smart (6)'" , "Stylishly attired" , "Nattily attired, wearing stylish clothes" , "Smartly clad, wearing stylish clothes" , "Smartly clothed" .)

I've seen this clue in The Washington Post.

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