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1. verb To be acceptable to one. In this usage, "suit" is followed by a reflexive pronoun. A: "I just don't have time to take a lunch break today." B: "OK, suit yourself."
2. noun A businessperson. In this usage, "suit" is the entire idiom. Oh boy, what are the suits from the corporate office doing here today?
Do as one pleases, as in We had expected you, but if you don't want to come, suit yourself. This idiom, which uses suit in the sense of "be agreeable or convenient," is often put as an imperative. [Late 1800s]
See also: suit