DIY Infinity Scarf: Easy homemade infinity scarf upcycle an old shirt and add some lace in only 3 steps. Adorable! Directions: 1) Cut the bottom off an old t-shirt leaving you with ring of fabric. 2) Next cut straight across the ring, allowing the fabric to lay flat like a regular scarf. 3) Finally, sew a piece of lace to each end, making a circle. And BAMM! Super cute homemade infinity scarf!