The present disclosure relates to a breast prosthesis having an elastically deformable outer body whose outer surface is patterned on a shape of a breast and having a plastically deformable inner body whose inner surface can adapt to irregularities of tissue of a wearer. In an example of the breast prosthesis, the inner surface of the inner body has a three-dimensional structure and/or is provided with a textile that is respectively configured such that a ventilation of the tissue surface can be achieved, and an intermediate body having an intermediate chamber is arranged between the outer body and the inner body and is configured such that a volume of the intermediate chamber can be adapted by filling with a fluid.