I just checked github and the version there says s4pe v0.1a, so I guess that's what I'm using? My download library in Firefox says I last downloaded the s4pe.7z file from github.com on Saturday the 12th.
I'm guessing identification of both compression algorithms is good? My knowledge on the subject is hazy.
I know there's still a lot to do in terms of figuring out modding, but let me know if I can do anything else to help or test. My first thought when I edited the skin was "hey, clothes recolors!", but in my temporary excitement I forgot that I'd have to add a recolor, not just replace a default. Not as close as I thought I was!