I have made these using heat transfer vinyl. Looks great. The white vinyl ended up being see-thru a bit, but it looked fine! The heat made the print from the shirt run onto the transfer paper, but it was not an issue.
I really liked these Tee,s Super soft. I have bought them before and plan on making another order soon. This time with winter just around the corner I will be buying a heavier Tee. I have some of the heavier T,s already and like them just as much.