Yesterday my Media Arts majors did a test printing of a t-shirt design. I was a little worried that cardstock would be too thick to use as a stencil, but fortunately fabric is flexible enough for this to not be an issue.
When we're done, each student will have their own unique design on the front and a common design on the back.
Only the printing process is done "by hand." Students made their designs using a free program called Inkscape. The stencil was cut out using my Cricut.