winter wedding dresses

Am singing/playing cello on the beach for a wedding/dinner reception. I don't know the protocol anymore of what to/not to wear (for the beach). Black? Tan?? White?? I have a really pretty long white beach dress I just bought from Sylvia Magdalena Garrido-Winter Robb that I'd love to wear but can I wear that to a wedding reception? Maybe the tan is better???? What do you think? Most likely though, it doesn't really matter.... but in the end, as I'm only a girl, it does matter at least to me!!! winter wedding dresses