My next x-kilt is in the planning stages and I'm trying to get a hold of some poly-cotton twill. Our local fabric store employees have told me that they've never seen poly-cotton twill at the store and I'm having some trouble finding online sources, so what is your go-to place to get suitable fabric?

Thanks,
David (who is itching for a shiny new rev-k x-kilt now that the weather's warm)