If you haven't heard of lumi photoreactive dye, check them out. http://lumi.co/ They fronted us a really cool kit, with red and orange dye, some washing solution, a roller for the dye and some of their very nice inkofilm.
The kit is ideal for setting up a small batch of shirts, or putting your personal touch on anything made of natural fiber.
Step 1: try it out
They included some sample cloth and a really cool negative to test print with. After fiddling with it a little, I found out that you need: A flat place to do your print. A way to hold the fabric flat. Good contact between the inkofilm and the fabric. Somewhere in the sun to leave your project where it won't be disturbed.
What doesn't work: Wrinkles really mess up the print Trying to overlay prints with another color comes out weird, unless it's lined up and dried. A black light will not cure the ink or make it change color. Printing on wood is possible, but tricky - especially cleaning the extra ink off later.
What works better than I ever expected: It's so easy. It cleans up really nice, both on the clothing and in your workarea. If you work inside and spill, it cleans up without dying or staining anything! The print is really soft and comfortable. It's part of the fabric, lighter than a screen print or a home-done freezer paper stencil.