I've bought a lot of different T-shirts and I'm always interested in trying to find a better (more durable; more fashionable; more comfortable) one. My current favorites are the Buck Mason Field Spec t-shirts
https://www.buckmason.com/collections/mens-tees — could you explain how your shirts might compare? I'm willing to buy one just to try it out, but since you're the owner, figure I might as well ask you for more information — especially why you created a custom cotton fabric.
One thing I like a lot about Buck Mason is that their T-shirts are made in America from American-grown cotton, are any of your T-shirts made in America?
EDIT: just ordered a variety of your shirts, looking forward to trying them out. Very easy checkout experience!