Step 1: Cut...
First, get a T-shirt.
Draw a line up the middle with a fabric pen.
Get your scissors and cut up the shirt along the line you just made.
Then, cut off the sleeves along the seam.
Step 2: ...and Sew!
Place the sleeves on the bottom of the shirt, as shown, for pockets.
Pin and sew...
and you're officially too cool for school!