We are going to a 30th birthday party (in a pub) next week and the theme is black and white. I'm going to wear a black jumpsuit a friend of the birthday boy keeps messaging me saying "remember you HAVE to wear black or white'. I Know that! I'm not stupid, I can read the invite. My DH has recently put on weight and it on a diet- his black jeans and trousers are too small and we are in no position to buy him a new pair to wear once. He's going to wear a black shirt and dark jeans. Are we being unreasonable?