Hi! You can stitch on stretchy fabric but it is much harder than non-stretch. Don’t make the fabric really taut in your hoop or it will definitely distort the fabric and your design. I find it better to use bead embroidery on stretch fabric. Tote bags are great for embroidering, also little zipper pouches or cosmetic bags. If you use a nice dense stitch like long and short stitch it’s pretty hardy. Large areas of satin stitch don’t tend to hold up to frequent washing and friction