Abstract: An artificial breast or mastectomy prosthesis is a light weight substantially breast-shaped pad having hook type fastening means at a plurality of locations about the periphery of the pad, which are fastenable to mating pile attachment means on the inside of the bosom area of a nightgown and are readily removable therefrom, when desired. More particularly, the artificial breast is of substantially triangular outline shape, when viewed from the front thereof, with hook tape fastening means at each corner and extending away from the triangle and with pile attachment means, ready for fastening to a nightgown, removably held to the hook tape fastening means. Specific pad structures are also described, as are nightgowns with pile attachment means and artificial breasts of this invention attached thereto, and a method of removably attaching the described artificial breast or mastectomy prosthesis to the inside of a nightgown.