Making a twin draft stopper can take up to an hour or more depending on your ability to cut and sew fabric. You need some scrap fabric, thread, fabric stuffing, pins, measuring tape, scissors, needles and a pencil.
Cut the fabric to size
Using the tape measure, find the depth and width of your door. This will determine the size of the fabric needed. Once you have these measurements, take the scissors and cut the fabric to the appropriate size. Give some extra space along the length of the fabric. For the width, cut the fabric so it is wider than twice the width of the door.
Sew the pockets
Prepare the sewing needle, pins and thread. Then fold the fabric in half along its length and pin the edges together so they line up. Maneuver the needle about 1/4 of an inch from the edge of the fabric and stitch all the way down. Once you have finished this, flip the fabric and lay it flat. Measure 2 inches from an edge, mark this spot, and then fold and sew it to stitch a pocket there. Repeat this process on the other side of the fabric.
Stuff the pockets
Put the fabric stuffing inside of the pockets you have just sewn. Because it's difficult to use your hands to stuff the material all the way to the bottom of the pocket, use a pencil to ensure you are evenly distributing the stuffing throughout both pockets.
Seal the pockets
Take out the needle and thread once more. Use them to stitch together the opening in the pockets you have created, closing them and shutting off access to them.