Ok so my future mother in law would like to wear the same dress she wore to her daughters wedding to mine. I couldn't remember what it was and said yah, sure if you want.  A few months later I was looking at photos and came upon the dress and realized it is an off white color. My dress is ivory. I was always under the assumption that the bride is the only one to wear white or any shade of white on her day. I'm conflicted with asking her nicely to wear something else or just not saying anything. Could I tell her what color my mom is wearing and ask her to base it off that? I dont want to hurt her feelings but I feel I'm the only one that should be walking down that aisle in white.