A form fitting nursing tank top/undershirt made with a stretch fabric includes an invisible build in nursing bra. The invisible nursing bra is partly internal and partly external. The external portion of the build in nursing bra is the left and right shoulder straps which from outside appearances form an integral part of the tank top/undershirt. The internal portion of the built in nursing bra is formed by a soft cup frame attached at the bottom to an elastic chest band and attached at the top to the front of the shoulder straps. In the back of the garment, the elastic chest band is attached to an internal back piece of fabric on the inside of the tank top. The internal back piece of fabric extends upward from the elastic chest band to the shoulder straps at the back, which shoulder straps each include an adjustable length section. Internal nursing flaps are attached at the bottom to the soft cup frame and at the top to the tank top body which forms external nursing flaps. The tank top/undershirt includes a continuous stretch body extending upward from the torso and forming the external nursing flaps which are attached to the internal nursing flaps and to the shoulder straps, to give a smooth single piece garment appearance.