need pretty but practical dresses for my girls to wear on boxing day when all my family and friends come over. need to be quite spangly/ party ish, but maybe able to be dressed down for wear during the rest of the year. also need to be 2 different dresses or same in different colours. need ages 7-8 and 8-9 please, and not costing a fortune. dont really want to pay more than £20 each ish.