Step 1: Cut Off Sleeves
First, cut off the sleeves of a long-sleeve T-shirt.
Step 2: Lay Sleeves Flat
Now, cut along the seams and lay the sleeves out flat.
Step 3: Mitten Length
Find a good length for your mittens, and cut off the extra fabric.
Step 4: Extra Fabric
Now, cut another piece of fabric about the size of the width of the sleeves, and cut a few strips.
Step 5: Sew on the Strips
Pin the strips to the sleeves, and sew them on!
Step 6: Sew the Sleeve Together
Next, have a friend wrap the sleeve (inside out) around your arm and pin it together; then sew.
Step 7: Cut Off the Extra Fabric
Cut off the extra fabric after sewing.
Step 8: Thumbs
Turn the mittens inside out again, cut thumb holes, and you're finished!