An elastic sleeve that uses cards to add support
You will need;
Sewing machine and thread
3 in Elastic webbing (1 yard ($2) will make several)
Cards and cash
Step 1: Measure and Cut.
Step 2: Sew
Leave a little room from the edge and ensure that you backsew both ends
Step 3: Flip Inside Out
Step 4: Done!
Congratulations! If you want you can make a pattern so you can crank these out!