Tomboy Popover ShirtGreen Sambourne Liberty Fabric The Tomboy is a popover silhouette with an easy, slouchy vibe, thanks to a deeper placket and a more relaxed body. (The buttons stop halfway down the shirt, so you can literally, yes, pop it over your head.) The easy shape really lets this archival pattern from Liberty Fabrics shine. This Sambourne floral was originally a large scale painting created in 1971, and shrunken down to a monochromatic, you sized print. made