Regarding those t-shirts I made last weekend... I backed each number with some iron on interfacing (even though it didn't seem to stick). I used quite a stiff cotton for the number two and a thinner cotton for the number four. The two was easier to sew.I made one a few years ago for a friend with fur fabric. I found this was actually easier to sew. Maybe because the fur allowed me to do a messier job!! I've had trouble loading the photo's so here is a photo of my pooches to keep you happy.