Dress code (5,3)

I think it could be either:

Which length description are you looking for?:

5,3

5,6

black tie

(Other definitions for black tie that I've seen before include "One accompanies DJ" , "Accompaniment of 11" , "Formal attire" , "Formal evening dress for men" , "It's worn with a dinner jacket" .)

I've seen this clue in The Sun.

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