noun which may take the genitive case particle 'no', noun
well-matched; becoming; suitable
Often used for couples who look good together, but also for clothes, accessories, or things that suit someone.
Those two are really well-matched, aren't they.
That dress really suits you.
That hat looks very becoming on you.
The two of them really make a well-matched couple.
That hat looks great on you.
似つかわしい is a somewhat literary adjective meaning 'fitting' for a person, role, or situation, whereas お似合い is a warmer, everyday word used to compliment appearance or pairing.
ぴったり describes a perfect fit or match in a broad sense (size, timing, personality), while お似合い is used specifically for the aesthetic suitability of clothes, accessories, or couples.
不釣り合い describes a mismatched pairing or ill-suited combination, the direct opposite of お似合い.
Standard polite spelling with honorific お.
Variant without the final い; less common but seen.
Polite form of 似合い (niai), the noun form of the verb 似合う (niau, 'to suit, to match well'), with the honorific prefix お (o-).