I have made a lot of children's clothes with the snap crotches/legs and have used individual gripper snaps on them. I haven't bought any lately but I don't remember them being super expensive. If you're concerned about the material not being strong enough then use some twill tape on the part where you apply the gripper snap. There is a small tool that you use to apply them and you need a hammer. I also used a small block of wood to protect my table top.