Following advice received in this class, I embroidered a purchased design on a purchased tee shirt. The fabric was highly elastic, and I was careful not to stretch when hooping it. I also used two layers of medium weight cutaway stabilizer at right angles to each other underneath. I didn't use a topper for better visibility while stitching, and the embroidery came out beautifully on the fabric, without puckering. The wearer was able to wear it without any stitches popping.