I have a Roxanne's brass thimble I use on my thumb, so it's pretty large. Check those out. My quilting buddy says her fingers are fat, too, and the one I use on my thumb fits her finger. I think mine is a size 9, but I don't remember what the largest size is. The dimples are nice and big/deep, and they cover the entire thimble so you can push from the pad of your finger or the side. The top is open for a fingernail to stick out, but there's a lip there so the needle can't slide off and stick you. I think the brass one cost me around $75 several years ago, but it'll never wear our or get holes in it like sterling silver can.