Im not so good at english, sorry, but I will give my best to describe the bug.

steves torso is the color of the tshirt, when it should be the color of the pants. because the pants are a part of the upper body, it doesnt make sense to have tshirt there. maybe its a cause of notch expirementing back when steve was made. also the zombie skin has an updated version of steves clothes, so it makes sense to maybe update the entire skin