We're getting married in early September at the justice of the peace in the states. I know you could just walk in with a pair of shorts, but with this being my one and only wedding, however small it is, I would like to find a nice but not expensive white summer dress. I've looked at Dorothy Perkins and River Island but those dresses seem a bit too casual. Any ideas? E-bay won't work because neither of us have a credit/debit card. Thanks for any suggestions!