Dressing for a wine country wedding

What's a fashionable chick like me to wear to a wine country wedding on a Friday night where she knows only 2 other people attending--the groom and the best man (an old boyfriend)?

The February wedding I went to was the perfect oppurtunity to wear my sheer white silk chiffon Co-Op top, Liquid pencil skirt, Wolford black fishnets and mega-high pink satin Prada's. But that just does not seem appropriate for this case.

This is what I was thinking when I woke up this morning. After a few more cups of coffee I'll figure it out and get packing. Or maybe go to Barney's.