Best clothes (4,4)

I believe the answer is:

glad rags

'best clothes' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for glad rags that I've seen before include "Special kit" , "Smart clothes (for a special occasion)" , "best suit" , "Best bib and tucker" , "Dressy clothes in happy shreds" .)

I've seen this clue in The Telegraph, the Evening Standard and The Sun.

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