some knowledge in sewing , some experience with stretchy fabrics
A sewing machine , an overlock sewing machine ( for a finished seam / a zigzag finish in your sewing machine) . A regular sewing kit: sewing pins, fabric scissors, a ruler. 100% polyester thread is the best for sewing knits
A marking fabric tool (Tailor's chalk or disappearing Marker Pen)
For printing cutting and putting pattern together: printer, paper, transparent tape and scissors.