This is the 552nd most frequent Korean word.
입은
"입은" means "worn" or "wearing" (past tense of "입다," to wear), or "mouth is" depending on context.
In this sentence, "입은" functions as an adjective describing the subject in relation to the act of wearing clothing.
그녀는 빨간 드레스를 입은 채 춤을 추었다.
She danced while wearing a red dress.
Here, "입은" is part of a verbal modifier indicating the state of having experienced damage or harm.
그는 사고로 큰 입은 피해를 복구하기 위해 노력하고 있었다.
He was working hard to recover from the significant damage he suffered due to the accident.
"입은" is used as a part of a descriptive phrase to specify the clothing worn by the group.