Slightly unconventional dress ideas?

So, we're getting married next year, and we're already doing a lot of it different from the norm -- neither of us are big on ceremonies, so we're just doing a small courthouse wedding with a fancy dinner at a nearby restaurant. Pretty bare bones.

The part I'm stuck on is my dress. I'm not really one for dresses (kind of a tomboy here) and most fancy wear just makes me feel uncomfortable in my own skin. He wants to keep the standard dress code, so I can't, like... do without the dress completely, but maybe there's a particular style out there I could look at or something? I don't have any specific ideas, but I also don't know a lot about how these things work so I'm open to suggestions.