I got some Siser heat transfer vinyl in black and silver from Specialty Graphics (I always seem to receive the vinyl slightly mangled, so I can’t recommend them particularly), they sell it by the foot for, if not cheap, a decent price. Using TechShop’s vinyl cutter (remember to mirror your image before cutting), I cut out three patterns:
The pictures look particularly bad, but the middle shirt turned out the best. It’s two waveforms imposed on each other, I actually did each as its own layer, just to make it more solid, though getting the alignment right was annoying.
Getting the ironing times right without a heat press is a bit hard, I ended up just cutting out a few pieces with scissors and trying different heat settings on the industrial style iron at TechShop.
Putting consistent heavy pressure on a single area seems to be effective, so doing large patterns is kind of hard without messing up the surface of the vinyl. I’ve got a teflon sheet to put on top which was useful for fixing parts that were not fully anchored after I removed the sticky clear side of the vinyl.
Still need to wash them to see if the vinyl is on there good, but it looks better than the last test.