So I'm a terrible procrastinator, but it might be good in this case. I found some sheer curtain material at the thrift store for cheap to make the first test stencil. Also, this week the craft store has blank tshirts on sale. I picked up 3 red ones (2 XL, 1 L) and a XL black shirt. Maybe I'm getting fat, but the sizes seem smaller than labeled. Oh well, they'll work.
So I'll work on the project this week, post the results, and if they turn out an people want them I can hit the craft store again while the sale is still on.