morning dress

US /ˈmɔːr.nɪŋ ˌdres/

UK /ˈmɔːr.nɪŋ ˌdres/

a man's formal daytime dress, consisting of a tailcoat, waistcoat, and striped trousers

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He wore full morning dress to the wedding.

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Morning dress is traditionally worn for formal daytime events.