You could also print off the design the size you want and tape it onto construction paper, use a craft knife and cut out the black parts - then use a brush or roller to paint over those areas, thus transferring the design onto the shirt - a stencil ! You could probably even get away without worrying about the construction paper and just cutting it out of the printer paper.
There's information out there on the best way to use paint on fabric, you have some options.
Just an idea for if you're not able to get the transfer paper in time, et cetera.
Disclaimer : This post written by a Grumpy Old Man
Actually in the pipes:
- Remaking Ser Loras doublet.
- Luke Skywalker, A New Hope
- Wind Waker starter costume in swim material
Eventually: Paul from Dune, Faramir, Harry Sullivan