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를 입고

wearing

→ 를
phrase Uncommon #8,288
wearing 를 marks the clothing as the object of 입다, meaning “to wear” or “to put on.” 입고 often connects this action to what follows.
KO: 그는 코트를 입고 밖으로 나갔어요.
EN: He went outside wearing a coat.

톰은 그의 방탄조끼를 입고 있지 않았다.

Tom wasn't wearing his bulletproof vest.