A good match or suitability (especially of a couple or of clothing); being becoming or appropriate.
二人は年の差があるが、とてもお似合いだと思う。
They have an age difference, but I think they're a very well-matched couple.
その青いジャケットは彼に似合いだ。
That blue jacket suits him.
結婚式にはお似合いの花束を選んだ。
I chose a bouquet that was fitting for the wedding.