Hey Charbride, I was just shopping this afternoon, and saw that Le Chateu has some really cute linen pants and suit jackets. You may want to check there. As for ordering online, there's a thread floating around here somewhere for $99 custom made suits. When I read through it, most of the brides were very pleased with that company. As well, Beach Wedding Attire: Drawstring Linen Pants, Cotton & Linen Shirts, Shorts, Skirts - Island Importer seems to have reasonably priced items. I think that's where we might end up ordering from, since FI has some crazy measurements, and it's hard for us to find things in stores that fit him.
I hope it all works out for you! Do let us know where you end up buying from!