If you want it to be waterproof don't put cotton sherpa on top, you might have wicking! You could try it out, but it might not be strong enough to make it through diaper washing, and then you will have a fitted diaper with broken vinyl inside!<br><br>
Just in case you did not know, the faux minkee they sell at Joanns works great as an outer without any hidden waterproof layer. Buy the slightly thicker stuff (actually, even the thin stuff works for my ds) with a tight knit weave backing, and not only is it breathable, but it works as good (if not better) then 200 MM fleece or Windpro. I can use that stuff in my night diapers as long as I have enough cotton inside to absorb the pee (like all diapers I guess). I make pockets with it as an outer and I have never had wicking or leaking. It is so soft and lovely!<br><br>
Once you add a hidden layer of vinyl or PUL it stops being breathable. I love faux minkee and am shocked that more people don't use it as an outer. Because it has that tight knit weave on the backside and it is poly, it takes a huge pee to make it leak.