Oh how I love Ruskovilla! I've been buying it the last three years. I've also bought Engel, but I really like Ruskovilla better because the cuffs seemed firmer, so they didn't ride up as much. I think Engel is much softer though, even the all wool.
I've bought long johns in both wool and wool/silk and we get more mileage from the wool/silk blend because it's thinner and softer and fits underneath his pants and shirts. The sleeveless undershirt is my ultimate favorite because it's form fitting and fits under every shirt perfectly.
I've also bought a couple of the wool zippered bodysuits - they're super cute on. They were great for PJs on those cold winter nights and after a year of use, they both looked nearly new. Unfortunately my son has a long torso so we couldn't get as much use out of them as I would have liked. Plus, once he was potty trained (around 2 1/2) years it was hard for him to zip and unzip himself and so he didn't really like wearing it as he likes doing everything himself.
I always buy mine from a mama owned Green Mountain Organics
and I'm pretty sure she carries the whole line, even for grown ups, even if it's not on the website.