Hey jgal,

I read on a website that you can use thermal backed calico, I bought 3 pass calico and put it in under the outer layer, which can be either flannel of cotton or anything. Also if you look up in the yellow pages website you will find E & M Greenfeilds in surryhills, and you can order the snaps from them at literally 1/10 0f the price - actually I can email you details if you like