Most of the festive dresses I'm finding are either really thick (Christmas is cold, shouldn't surprise me!) or one of those hideous sweat making fabrics. What should I look for when buying clothes? I am on stage a LOT over this festive period - dancing and hot lights! - and need to be able to breathe and ideally not be sweaty. But also as uber festive and glitzy as possible. And am size 18! Having a nightmare!!