Husband's friend's wedding: What should I wear?

@Nykkee (2524)
April 3, 2008 1:25pm CST
My husband's friend is getting married in late May. My husband is standing as an usher in the wedding for his friend and so he will be wearing a black tux, I would assume, his clothing will be provided. I however, am just goin with my husband, I do not have a role in the wedding beyond being a guest. I need to get a new dress and I don't really know what I am looking for. I know that you should never wear white to a wedding, but are there any other taboo colors? How fancy a dress should I wear? Should I dress really fancy so I match my husband in his tuxedo, or should I wear a less formal dress? Someone give me some advice please. As I said, the wedding is in late May so it's a Spring wedding, I don't know if that affects what color I should wear or not.