I'm throwing a baby shower this summer for my MOH, so so excited! Mom to be is allergic to polyester, she will get a rash in less than ten minutes and baby could also be allergic. Would it be tacky to include a card to ask people to refrain from buying items with polyester. I know it's a long shot that people will actually do it, but she will feel terrible if she gets all this stuff she can't use and can't return. I know if I was a guest, I would rather know than not. Thoughts?