I had an old tshirt. And a new rotary cutter. And unused shoelaces.
Did you think I was just gonna let those things sit there?
(apologies for the terrible Paint illustrations)
First, take your T-Shirt and cut off the sleeves.
Now cut up the middle through only one layer of fabric.
Put it on and see how you like it. I guess this step doesn't really matter, but I like to see how it fits.
You can stop here if you want to.
So now comes the fun part!!
Lay down your t-shirt, line everything up. Take out your ruler and mark out evenly spaced dots every inch to 2 inches. I did 2 inches.
Do this for the other side of the t-shirt, too.
Now cut slits in every little dot you marked.
Put it on and lace the shoelace through it.
Bam! New trashion/recon shirt!!