[masraum]

Key Largo will be nice at dusk. It's an island surrounded by water, so it should be pretty comfy. I'd still think that a suit would be darn uncomfortable (but then I think a suit is ALWAYS uncomfortable).

I'd definitely say, ask the folks who're having the wedding. Personally, I think that if you're having a wedding outdoors in Florida in the summer (especially on the beach) and you aren't expecting shorts, Hawaiian shirts and flip-flops, you're being discourteous, but that's just me.

Another great thought by nostatic, a light pair of thin cotton/silk/linen pants would be acceptible as well, especially in the evening.

ASK the folks getting married!