I'm working on a source for good quality polo shirt as I want to do something similar as to what you
are describing.
I'm biting more of a bullet than what I wanted to because I went with the best quality T-Shirt they
had. The Hanes Beefy-T. I will post the specs in the other thread at some point.
There will be a full description on the product page if the Admins will let me "set up shop" as a dealer.