I rotate throughout the day. DS won't wear knitted wool anymore but it's pretty much the same with covers. I alternate between 2 and how every many match his outfit for the day. I'm really OCD about his :LOL. I canNOT have just one woolie goodie to match a shirt, I have to have at least 2, otherwise I am beside myself while one is airing out. We go coverless quite a bit at home though.