I think the dresses can look ok if they're in one non-garish colour and aren't paired with schwarzkopf real red hair, victory rolls and 9 gallons of eyeliner (the ultimate 'I'm a bit quirky, me' look.)
I know it's a cliche to take the piss out of but the ubiquitous 'nice jeans, sparkly top, and heels' advice. How sparkly is sparkly?