This is the 9318th most frequent Korean word.
겉옷을
"Outerwear" or "coat."
The word '겉옷을' refers to outer clothes that the subject wears to keep warm.
나는 추워서 겉옷을 입었다.
I was cold, so I put on outer clothes.
Here, '겉옷을' is used to indicate the outer garments that are removed upon entering a place.
그녀는 겉옷을 벗고 방에 들어갔다.
She took off her coat and entered the room.
In this case, '겉옷을' signifies the outer garment that one is reminded to keep in good condition.