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Ricky Ricardo style - a black tux with a conga drum! (kidding) A light colored suit, or even nice pants with a lightweight jacket in Ivory or light beige would look great.

Formal attire usually means for guys a suite and tie. Since its a tropical theme wear a white suite. I always see rich men in white linen suites. But you find what you can, have fun.

bright turquoise tux with a parrot on your shoulder? seriously, the theme has little to do with what you wear. formal attire defines it. I assume a coat and tie will suffice and that a tux isn't really necessary. It's a 15anera, not a wedding.

Wear a cool guayabera, crisp pants, nice shoes, and a hat.

If anybody gripes, tell 'em that guayaberas are tropical formal wear.

cute dress with bright pattern