Abstract: A breast prosthesis in which a negative cast is formed of the wearer's remaining breast and the area of the missing breast. A positive cast is formed of the negative cast and a model is made of the missing breast. A flexible mold is formed over the modeled breast and a portion of the positive cast. The flexible mold is removed and a coating is applied to the positive body cast to form a rear wall with a filling opening. A resilient coating is applied within the flexible mold to form a forward wall of the prosthesis and both the forward and rear walls are secured together. Gel fill is inserted through the filling opening into the interior space formed between the forward and rear walls.