A body fitment for an ostomy appliance comprises an adhesive wafer including a body-facing side for adhesively contacting the user's body. The adhesive wafer includes a moldable region shapable by the user, and a hole therethrough for allowing the user to manually mold a stomal aperture in the moldable region. The body fitment is provided with the inner peripheral region of the adhesive bordering the hole being pre-shaped with a non-planar configuration, e.g. bent or curled away from the body-facing side of the adhesive, prior to be being molded by the user. The pre-shaped, non-planar, configuration is supported by a release device that initially protects the body-facing side of the adhesive but which is intended to be removed prior to use of the body fitment, to enable the adhesive then to be molded by a user.