Wedding dress for court house wedding??

I’m having a courthouse wedding!! And I was never that girl to want a big wedding but now I would like a little something.. I have no family and neither does he.. we both have a couple friends and a little bit of out of state family.. we normally see them on some holidays ever couple years or so.. when we do get married we will probably have a very small get together with the couple friends in town, but it will most likely be at our house, or theirs.. nothing fancy..

but I do want a nice dress, if anything to just get pictures in.. I want it casual enough to go to the courthouse and then wear to the get together and then wear when we celebrate with our families.. I want pretty, casual and something like white.. maybe more champagne.. where can I find something like this?