Where to Source High quality blank t-shirts?

From the link you have shared, we just know how the t-shirt looks and fit on a real model. You can get a same cut t-shirt if you order from customized line. Meanwhile, it is a cotton t-shirt seeing from the description,when you said "rough", so focus on ring-spun combed cotton used for your t-shirt, and get an additional treatment to the fabric like enzyme wash to get a best softness. Hope you will get what you want.

-bill

Have you taken a look at Bella + Canvas or Next Level? Two companies that specialize in fashion fit and feel at good prices.

I would also recommend canvas or alternative apparel.