Abstract: A retainer capable of retaining the strap of a foundation garment upon the shoulder of the wearer so as to conceal the strap and maintain it concealed under the outer garment. The retainer is an elongated sleeve having a base, two side walls and a split top, together defining a passageway for the strap. The retainer is of a single piece construction molded from a material having slip resistance in contact with human skin and with clothing materials. After placing a foundation garment strap through the split top into the passageway, the retainer is placed on an appropriate part of the body, generally on the shoulder, concealed by the outer garment of the wearer. The retainer clings to the body and to the outer garment and maintains its position during wear of the garment.