T-shirts are fabric devices to cover your chest and torso and stomach if you want. Are chest and torso the same thing? They have 4 holes, but only two are the same size; the sleeves. The hole on top is for your neck and your head will be above your neck usually, but you do you. The bottom hole is huge depending on what you're comparing it to. A volcano has a bigger hole usually, but that's a weird hole on top of a pissed-off mountain. This is just a hole where your body changes from torso to hips and legs. Basically this is what a shirt is.