This is the 544th most frequent Japanese word.
着
"着" means "arrival" or "to wear" depending on context.
The word "着ています" (kitemasu, "is wearing") is used here to describe the action of wearing or having clothing on.
彼は新しい服を着ています。
He is wearing new clothes.
The word "着" (chaku, "arrival") in this context indicates the arrival time at a particular destination.
東京に朝１０時着の新幹線に乗りました。
I took the Shinkansen that arrives in Tokyo at 10 AM.
The word "着" (ki, "to wear") is part of the compound form "着飾る" (kikazaru, "to dress up") indicating the action of adorning oneself with clothing.