Every sewing project requires certain supplies. Your first supply is fabric. This can be pretty much any fabric or set of fabrics that you want. Some people choose to use strips of fabric, while others prefer one or two solid pieces for a more consistent pattern. Ensure you use a soft fabric to prevent scratching your iPad, such as cotton or fleece. Check out the sleeves for sale to see their protection design.
You will also need a sewing machine or stick with regular needle and thread. The machine is quicker for most, but the old fashioned ways works, especially if you're only creating the one iPad sleeve.
The final element is some sort of padding. To keep your iPad safe, you need something to keep it from banging and bumping so easily. Adding a thin layer of foam on the inside of the sleeve is a great way to not only protect, but create a tighter fit. Alternately, use a quilted design, which is thicker, providing protection.
Depending on the pattern, you may also need velcro, tape, felt, batting and/or buttons. Each pattern will specify the exact supplies you need to start.
Image Credits: iPad Sleeve Pattern / InnovativeSewing.com