We got our whole family the wool/silk ones fro nova naturals last year and love them.
I really recomend sizing up for the kids incase they go through the dryer accidently.
I didn't size up because my dd is on the small side anyway and I was afraid they'd be baggy, but when they arrived I tried my nephew's on her (a size bigger) and they weren't baggy at all, so we would have been okay.
All ours are still being worn and are in decent shape, except for a few holes. We wear them a LOT though. If you want to avoid holes don't wear them around the house without pants over like I do
