Buy this shirt: https://topmug365.com/product/ive-decided-to-enter-the-transfer-portal-t-mug/
Yes it can be very profitable, or a nightmare you pour money into and get little out of. Let me explain. There are 4 distinct types of companies and others who use t-shirt printing as product only. The key to making money in this business is simply to avoid debt payments or high rents. Also selecting the right presses, screen mesh, and emulsions is a key component to printing non-stop. In all automatic press cases discussed, if the machine stops due to poor screens, you lose money every minute it is down.
The USA, The T-shirt came to the USA during WWI when US soldiers noticed the light cotton undershirts European soldiers were using while the US soldiers sweat in their wool uniforms. They quickly became popular among the Americans, and because of their design, they got the name T-shirt. What became the modern T-shirt was developed in 1932 when officials from the University of Southern California Trojans football team (often credited to coach Howard Jones) asked Jockey International, Inc. to develop an inexpensive undergarment to absorb sweat and prevent a football player’s shoulder pads from causing chafing. This resulted in the invention of the crewneck (or crew-neck) T-shirt. 
Er…well, this American does. I wear T-shirts frequently, because they’re comfortable. They’re very commonly worn in the US. I expect most Americans would have reason to refer to them at some point, even if they don’t wear T-shirts themselves. The cost of manufacturing is increasingly influenced by advances in automation. With this progress the cost of labor, and consequently geography, will play less of a role as delivery times become more important. A recent article citing a Chinese company building a factory to manufacture t-shirts in the US summed it up nicely:
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