Crossword Genius

A rebuke for wearing jeans at the wedding? (8,4)

Ross

I believe the answer is:

dressing down

I'm a little stuck... Click here to teach me more about this clue!

'a rebuke' is the definition.
(dressing down is a kind of rebuke)

'wearing jeans at the wedding?' is the wordplay.
I cannot really understand how this works, but
'wearing' could be 'in' (in jeans or in a dress) and 'in' is present in the answer.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

(Other definitions for dressing down that I've seen before include "telling-off" , "Severe scolding (wearing casual clothes?)" , "using low gear?" , "Severe scolding (in old clothes?)" , "rebuke" .)

I've seen this clue in the Evening Standard.
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