There is one called Cover-A-Stitch just for that. They have it at All Stitch. Link is below. It is great for infants and children's clothing and for anyone with sensitive skin.
Marcelle
Pellon also makes a knit interfacing that I get at Joanns with a sale or a coupon.
Cloud cover is often available on special from Shopper's Rule.
It is a wise idea to become a member for free and receive their emails notifying you of special buys.
Only problem I have with Shopper's Rule is that the shipping to Australia takes twice as long as anyone else I buy from in the States.