attire
n. uncountable B2 Upper Intermediate US //əˈtaɪɝ// UK //ɐtˈaɪə// at·tire
n. clothes, especially formal or special ones worn for a specific occasion.
n. clothing or dress, particularly when formal, distinctive, or appropriate for a specific occasion.
She wore elegant attire to the wedding.
The invitation specified formal attire, so he put on a dark suit and tie.
The museum's strict dress code required modest attire, ensuring that visitors respected the solemn atmosphere of the ancient galleries.
The verb is from Middle English atyren, atiren, from Old French atirier (“to equip”), from a- + tire (“rank”), akin to German Zier (“ornament”) and Old Norse tírr (“glory, renown”). The noun is from Middle English atir, from the verb.