A gaff is a type of undergarment that is designed to compress or flatten the genital area and create a smoother, more streamlined appearance. Gaffs are typically worn by people who were assigned male at birth and who want to create a more feminine silhouette, as well as by transgender women, drag performers, and others who want to create a more gender-affirming appearance. They are designed to be worn under clothing and can be an effective way to create a more feminine appearance without surgery. They can be worn with our without "tucking" (see below). Amongst many other things, gaffs can help folks fit certain clothing designs (like swimwear) in a way that is more comfortable and affirming. For many trans femme folks, tucking is also important to their safety when out in public.