How do you turn a Tshirt into a hood?
Lay the T-shirt on a flat surface.
Cut off the sleeves of the T-shirt, leaving the armholes.
Fold the shirt in half with the front side facing out.
Cut a straight line from the folded edge to the armhole on either side.
Fold the edges of the cutouts inwards 1/4 of an inch and iron them down to create a seam.