Pair of pajama pants
Optional but very helpful tools:
Rotary cutter (scissors of course will work but I cannot reccomend a rotary cutter enough!)
Sewing machine (everything you can sew on a machine can be sewn by hand.)
Gathering foot (If your machine shirrs with elastic you can do that too, if you cannot do either you can hand ruffle it takes a bit more time but not much.
Quilting guide (Super helpful in keeping gathering stitches somewhat straight)
The amount of pins you use depends on your type of needle. If you have a needle meant for jersey (or stretch fabrics at least) you shouldn't need near this many. But, if like me at the time you do not have said needles, pins will help you keep the fabric from puckering.