Abstract: The sportswear undergarment for a residual leg includes an expansible waist band for encircling a waist of a wearer, a fabric seat portion connected to the waist band, a fabric abdomen portion connected to the seat portion and waist band in a manner such that the seat and abdomen portions substantially enclose the seat and abdomen of the wearer while defining a pair of oppositely disposed open surfaces, a first fabric leg portion connected to one part of the open surfaces and extending in an encircling manner therefrom to a predetermined region about one thigh and a second fabric leg portion connected to another of the open surfaces and extending in an encircling manner therefrom to a predetermined region about another thigh, wherein at least one of the leg portions further includes an enclosed end configured to conformingly receive a residual leg portion of an amputee.