An implantable prosthesis for repairing a tissue or muscle wall defect, the implantable prosthesis comprising: a patch of repair fabric including a body portion that is constructed and arranged to cover the tissue or muscle wall defect, the body portion including: a first layer having a first surface and a second surface; a second layer, separate from the first layer, the second layer being positioned over the first surface and attached to the first layer to provide a first pocket, said first pocket being the only pocket that is located between the first surface and the second layer; a third layer, separate from the first and second layers (24,28), the third layer being positioned over the second surface attached to the first layer to provide a second pocket which is the only pocket that is located between the second surface and the third layer; a first opening in the second layer to provide access to the first pocket to facilitate deployment and/or placement of the prosthesis at the tissue or muscle wall defect when the body portion is arranged with the second surface of the first layer facing the tissue or muscle wall defect; and a second opening in the third layer to provide access to the second pocket, characterised in that the second layer is attached to the first layer and the third layer is attached to the first layer such that the second and third layers overlie each other on opposite surfaces of the same portion of the first layer, and such that the first and second pockets (26,36) are located on opposite surfaces of the same portion of the first layer. a patch of repair fabric including a body portion that is constructed and arranged to cover the tissue or muscle wall defect, the body portion including: a first layer having a first surface and a second surface; a second layer, separate from the first layer, the second layer being positioned over the first surface and attached to the first layer to provide a first pocket, said first pocket being the only pocket that is located between the first surface and the second layer; a third layer, separate from the first and second layers (24,28), the third layer being positioned over the second surface attached to the first layer to provide a second pocket which is the only pocket that is located between the second surface and the third layer; a first opening in the second layer to provide access to the first pocket to facilitate deployment and/or placement of the prosthesis at the tissue or muscle wall defect when the body portion is arranged with the second surface of the first layer facing the tissue or muscle wall defect; and a second opening in the third layer to provide access to the second pocket, a first layer having a first surface and a second surface; a second layer, separate from the first layer, the second layer being positioned over the first surface and attached to the first layer to provide a first pocket, said first pocket being the only pocket that is located between the first surface and the second layer; a third layer, separate from the first and second layers (24,28), the third layer being positioned over the second surface attached to the first layer to provide a second pocket which is the only pocket that is located between the second surface and the third layer; a first opening in the second layer to provide access to the first pocket to facilitate deployment and/or placement of the prosthesis at the tissue or muscle wall defect when the body portion is arranged with the second surface of the first layer facing the tissue or muscle wall defect; and a second opening in the third layer to provide access to the second pocket, characterised in that the second layer is attached to the first layer and the third layer is attached to the first layer such that the second and third layers overlie each other on opposite surfaces of the same portion of the first layer, and such that the first and second pockets (26,36) are located on opposite surfaces of the same portion of the first layer.