Hi, since Jim doesn’t sew he passed this one to me. Use a #90 stretch needle and a good quality polyester sewing thread. My all time favorite is metrosene. It is Strong and lint free. I have sewn tons of dance costumes, skating costumes and swim suits. Before I owned a serger I used a narrow zig zag (2.5 width x 2.5 length) it made a nice stretchy seam that didn’t pop. Good luck