From What I have seen the side pouches are a natural unbleached muslin color. I was considering using tea to dye white fabric to the right color, but ended up finding some fabric that is nearly the perfect color, just need to weather it. Though in some shots they do look grey, may be it just me.
The two peice jump suit, is what I am going to do as well. In my case I am long waisted and can't find any jump suit or pattern that will fit properly.
Alan