To suit or match someone/something; to look good on someone; to be appropriate or becoming.
そのドレスは君によく似合うよ。
That dress really suits you.
新しい髪型、すごく似合ってるね。
Your new haircut suits you a lot.
二人はお似合いの夫婦だとみんなが言っている。
Everyone says they're a well-matched couple.
その帽子は彼の雰囲気に似合わない。
That hat doesn't suit his vibe.