The stabilizer is one of the most important parts of making a t-shirt quilt. Once the t-shirt blocks have been stabilized, you can sew with them like regular material. I use a fusible light weight knit stabilizer that stretches in one direction. I fuse it to the shirt with the stretch in the up/down position. The shirt stretches left/right. Once they are fused together the shirt does not stretch at all. I always fuse a larger area so that I can cut the shirt into a precise size block after fusing. Good luck. Ann