Grace Kelly was in a vintage blue chiffon gown in the movie "To Catch a Thief". Grace Kelly blue dress was a floor length a-line evening prom gown, with spaghetti straps and draped detailing at the shoulder. The two-toned chiffon color looked great on her. Are you looking for Grace Kelly To Catch a Thief blue dress for sale? Get this dress for only 159.99 for your prom.