I'm worried about what my FI's parents might wear to our wedding and I don't know if I should address it or just cross my fingers that it'll be OK. His dad owns a tux and is planning to wear that, however all the men in the BP are wearing suits as is the FOB. His mom wore a wrinkled black dress and dirty sandles to his sister's wedding last summer and showed-up to my bridal shower in jeans, a t-shirt, and her sneakers she wears for gardening. generally I could careless what people wear, however as the groom's family they will be in many of our wedding photos.
do I drop hints? offer to go shopping with her? ask my FI to talk to them? just leave it alone?