Is it acceptable? Do the etiquette rules extend on the the evening do as well?
I want to wear this dress:
www.asos.com/Victoria-Beckham/Asos/Asos-Ponti-Roma-Tailored-Pencil-Dress/Prod/pgeproduct.aspx?iid=667555
But don't want to put the bride out by wearing her colour! (The dress is available in red but red doesn't suit me by the way)