My sister has been invited to a wedding and the invitation stipulates that there is a red, black and white theme so guests must wear one or a combination of these colours. Has anyone ever heard of anything like this before? Sis is seriously hacked off as she's pretty broke, has nothing suitable in these colours and will now have to go out and buy a brand new outfit even though she has a couple of hardly worn wedding outfits in her wardrobe that she had intended to wear.