Welcome from up province of, upstate NY. We call it Canada. Poly-Viscous (poly-rayon) makes a lovely and suitable substitute for wool from a reputable scource. Although nothing beats wool on a cold winter's day. There has bee some discussions of non-leather sporrans, I don't recall that a really suitable material was found. Please remember also that a kilt does not have to be tartan it can be canvas or hemp, even (shudder) leather.