Polka dots, especially in monochrome, never go out of fashion and can be brought out of the wardrobe year after year. The look can be updated by adding accessories or make-up in the season's latest colour, for example a neon nail for SS '13.... or mix and match your polka dots like we've done!
Joanna's outfit : top and skirt from Dunnes Stores (several years ago). Similar skirt can be found on eBay here and similar shoes from M&S here.
Camille's outfit : dress from ASOS here, bag and scarf from TK Maxx, sandals from M&S (no longer in stock, but find similar at Own The Runway here).