I use regular velour because I can't afford organic. It works fine as long as it's high cotton content. I have some that's only 65% cotton and it's not very good in diapers. 80% cotton is much better. Like what they sell at diapershop.com.
I dont use organic, But you want it to be at least 80% cotton. I can afford the oganic stuff either, but I love the velour for diapers, and great for trainers when babe is older too, nice and stretchy