1. Cut the sleeves off of your denim jacket just below the shoulder seam. Your jacket should look like a vest now. *Do not discard the sleeves, you will use them later! *
2. Next, use your sleeve as a base pattern. Fold it in half and place with the outer edge on the fold of your sequin fabric.
3. If you want to make the sleeves oversized, cut outward from what would be the underarm, creating a bell shape. Add length to the oversized sleeve as well. *Make sure the top opening of your sleeve stays the same size, so it fits into the armhole of the jacket. *
4. Cut out both sleeves.
5. Pin and straight stitch the long open edge closed on both sleeves. *If you’re not comfortable sewing, use Fabri-Tac on any seams. *
6. Turn the vest inside out.
7. Pin the sleeves onto the armhole. *The sequin sleeve should be on the outside of the armhole when inside out, so that when it’s turned right side out, the sleeve lies underneath the shoulder seam of the armhole. *
8. Secure the sleeve to the interior of the shoulder seam of your jacket. *If sewing, use a similar color of thread to your jacket. *
9. Cut the cuffs off of the pre-existing jean sleeves.
10. Use your needle and thread to sew a running stitch around the bottom of the sequin sleeves and pull to the same circumference as the cuff of your jacket.
11. Sew the bottom of the sleeve to the interior of the cuff.