Set on the French Riviera To Catch a Thief(1955) is the most lightweight of Hitchcock's films. It stars Cary Grant and Grace Kelly and is a sheer delight to watch. Based on the same name novel by David Dodge, Hitchcock directs Grant as a notorious reformed jewel thief and Kelly as the rich heiress.
The setting and the costumes are wonderful. Grant is prelude to Connery's Bond with his debonair dress and self deprecation. Edith Head created pure class for Kelly with an array of costumes that say holidaying on the Riviera culminating in a spectacular gold evening gown for a masked ball.
If your fresh out of ideas for a vintage summer look then To Catch a Thief is the perfect viewing.