"青ジャケットが兄、赤ジャケットが弟//兄は悲しみを知らない。弟は笑い方がわからない" - kajiwara shikaji

I'd tag it "suit," but that pulls in the "formal" tag, and nothing seems formal about the way they're dressed.

"Blue jacket is elder, red jacket is younger. // Elder doesn't know sorrow. Younger doesn't know how to smile."