An idea whose time still has not yet come!
Step 1: Stuff Uneed
Warning: First and foremost, you need a pair of earplugs if you are going to step into a Walmart for the clear vinyl sold by the yard there. I don't know about yours, but our local Walmart has televisions on every aisle blasting advertisements at you that are profoundly rage inducing. With the earplugs you can almost totally block them out and actually get away from them in some aisles.
soft thin flexible vinyl (got this at Walmart for 2 bucks a yard)
peel'n'stick fabric fuse (also from Walmart for 3.50)
white tshirt (walmart $4.50)
Step 2: Cut the Vinyl Out
First, cut out the plastic sheet into a square shape. I used a sheet of 8.5x11 paper as a guide. Keeping the edges square is always a challenge for me. I also used a paper cutter to get a straighter edge.
Step 3: Center It
The first hard part is figuring out where exactly the center of the shirt is. I laid the tshirt out on a cookie cutter and just eyeballed it. About 2 inches down from the neckline seems to be about the typical height for a tshirt design. ymmv.
Step 4: Stick the Plastic On
Then, get out the fabric fuse. It's two sided and you only get one try! This is the second hardest part of the whole thing. Lay down a straight long strip of it almost exactly the width of the vinyl square.
Peel off the top layer to reveal the stickyness. Then very slowly and carefully align the vinyl's top edge to the stickyness and press it down. This is not easy to get right. Be careful to cover all the sticky surface with the vinyl. Don't leave any exposed or it will collect ink and fuzz and be yucky after a while.
There's a bit of a visible seam, but I find it acceptable.
Step 5: Stick Down the Edges
Now just use the fabric fuse and do the sides of the square. This isn't too hard if you got the top okay. The next part is the hardest.
Step 6: Hardest Part: the Final Edge
Those of you who are actually robots will probably scoff now. "Wow, that's clearly made by a human. Humans couldn't recognize a straight line if it hit them over the head!"
I really didn't want to seal up the bottom edge because I just *knew* that it wouldn't line up right and and it would have wrinkles in it. And so it did. I might have been able to just leave the bottom edge hanging free, but it didn't seem right.
Cut out the last strip of fabric fuse, if you dare, and somehow by robot magic wiggle it under the bottom edge and remove the paper backing. If you a clutz like me, you may wind up with some wrinkles.
Step 7: Le Fin
Well, there it is.
Step 8: Caveats
There are several things wrong here.
1. I don't think it will survive washing or drying. But if it does, that would be pretty cool.
2. It definitely would not survive ironing. The vinyl will get all warply.
3. If you get the whiteboard marker on the fabric, well, it will probably stay there. Maybe it will wash out, but see caveat 1.
4. After a bit of erasing, eventually the dry erase stuff kinda gets rubbed onto the edges of the fabric creating a gnarly dirty looking edge.
N.B.: I first tried just sewing the plastic onto the tshirt with disastrous results. (see photo) (i can haz prozac now?)