Sleeved partial undergarment and garment system

A garment system comprising:

• an outer shirt including at least an outer shirt neck edge defining an outer shirt neck opening, an outer shirt torso edge defining an outer shirt torso opening, and distal-most first and second outer shirt arm edges defining first and second outer shirt arm openings;
• and
• a unitary sleeved partial undershirt separate from the outer shirt and configured for ease of wearing beneath the outer shirt, wherein the unitary sleeved partial undershirt includes:
• tubular first and second sleeves each having a respective proximal end and a respective distal end, each having a tubular construction between its proximal and distal ends that is void of any fastener, and each having a length of at least 12 inches, wherein, when the sleeved partial undershirt is worn under the outer shirt, the distal ends of the first and second sleeves extend through and beyond the first and second outer shirt arm openings, respectively;
• a yoke including a front yoke portion, a back yoke portion, an undershirt neck edge defining an undershirt neck opening, and an undershirt torso opening edge defining an undershirt torso opening, wherein the yoke extends continuously and non-separably between the first and second sleeves, and wherein a distance between the undershirt neck edge and the undershirt torso opening edge at both the front yoke portion and the back yoke portion is in the range between 1.5 and 8 inches, wherein the undershirt torso opening is asymmetrical such that points of the proximal ends of the first and second sleeves that are distal-most from the undershirt neck opening are on back portions of the first and second sleeves.