Thanks a bunch! I’m using exactly one vinyl— the black and pewter are metallic spandex. The vinyl, though, is 4-way stretch. I got all of it from a store in downtown LA called Michael Levine’s, but they don’t have an online store so you’re out of luck there (also, their vinyl selection is really hit or miss). However, myself as well as a few cosplayers from my forum have had good experiences with MJ Trends.
You can also check out my vinyl info on the TCos materials wiki. There’s some links there too. Cheers!