To keep hosiery from sticking to your dress, rub a damp used dryer sheet over them. Toss one in your luggage, just in case (it'll freshen your clothes). If you don't have one, run a wire hanger or a metal spoon over or under your dress.
Baby powder is great for treating wedding-dress stains. Sprinkle on to absorb oil from spots, then brush off with a white cloth. It's also useful for hiding the residue of wine and makeup stains after you've used stain-removal wipes.