If your t-shirts sit fine on the shoulders and then grip across the stomach, the problem is almost never your body. It is fabric weight and pattern grading, and both are fixable by buying differently.
Why thin fabric clings
A t-shirt at 150 GSM has almost no structural weight. It has nothing to hold it away from the body, so it drapes onto whatever is underneath and follows the contour exactly. Add a little static or humidity and it holds there.
Heavier fabric behaves differently for a purely physical reason: it has enough mass to fall. It touches at the shoulders and chest and then hangs away from the torso between those points. The result is a straight line from chest to hem instead of a shape that maps the midsection.
This is why fabric weight, not size, is usually the fix. Sizing up in a thin shirt gives you a larger shirt that still clings, now with extra fabric at the shoulders.
The second cause: sizes graded from one template
Most brands draft one sample size, usually a medium, then scale every measurement up and down by fixed ratios. It is fast and it is cheap and it assumes a 2XL body is a medium body at larger scale.
It is not. As men get larger, midsection volume tends to increase faster than shoulder width. Uniform grading widens the shoulders and the chest at the same rate as the waist, so the shirt ends up loose where you do not need it and tight where you do.
Brands that draft each size independently can do the opposite: keep the shoulder honest and give room where it is actually needed. TGTHR writes individual sizing rules per size rather than grading from a single template, which is the reason the larger sizes are shaped differently rather than simply bigger.
What to look for instead
Fabric weight above 250 GSM. Below that there is rarely enough mass to hold the fabric off the body.
A roomy hem opening. A shirt that narrows at the hem will pull inward at exactly the wrong place. A wider hem lets the shirt hang straight.
100 percent cotton. Polyester blends generate static, and static is what makes a shirt stick after an hour of wear.
A collar built for the body fabric. A stretched collar drags the whole shirt forward and changes how it hangs.
Things that do not work
Sizing up. Produces a bigger shirt with the same problem.
Compression layers. Adds heat and a second fabric surface, and thin outer fabric will still map whatever it sits on.
Fabric softener. Softener coats fibres and can increase static cling rather than reduce it.
Frequently asked questions
Why do my t-shirts stick to my stomach?
Usually lightweight fabric with no structural weight, sometimes worsened by static from a polyester blend. Heavier 100 percent cotton is the reliable fix.
What GSM stops a t-shirt clinging?
There is no exact threshold, but fabric at 250 GSM and above generally has enough mass to hang away from the body. The TGTHR TG1 is 420 GSM.
Does a bigger size stop clinging?
No. Cling is a property of the fabric, not the size.
The TG1 is built specifically around this problem: 420 GSM, 100 percent cotton, a roomier hem opening so the shirt sits loose at the waist, and per-size patterns. Sizes M to 3XL, with a 30 day return window and a free return label.