SASH – BASICS THAT SASHIFY. Crafted from the finest fabrics by the finest designers Sash envelopes your body in the comfort and style it craves. Half slip skirts have long been the undergarment of choice for women who love wearing their skirts and dresses with panache.An outright feminine piece of clothing SASH’s half slip underskirt helps prevent static and doesn’t let your skirt or dress stick to your thighs.