I would say that the transfer size should increase a bit with the increase to certain tshirt sizes. I pressed a sample image on an XXL bamboo/organic cotton tee and the tee at up the image, IMO. The transfer was about 8" x 10".
What would be good for your stash is to buy 5 tees in sizes S, M, L, XL, and XXL. Then, make a standard 8.5 x 11" transfer to press on all of them. With that, you can show customers how that "standard" sized image will look on the various sized tshirts.
If you can go larger because they want larger, then you can.
What would be good for your stash is to buy 5 tees in sizes S, M, L, XL, and XXL. Then, make a standard 8.5 x 11" transfer to press on all of them. With that, you can show customers how that "standard" sized image will look on the various sized tshirts.
If you can go larger because they want larger, then you can.