I did a post on the test jacket previously, I was going from a one layer fleece jacket to a two layer reversible fleece jacket. I used snaps from Snap Source for these jackets and you can put them on in a way that they are also reversible so no matter which side the kids want to wear, the jacket can be closed.
If you missed it before, the pattern is from SewBaby, it is called Wonder Jacket, and it is available on the following website. The pattern goes from 12 months to 4T.
http://www.sewbaby.com/shopbaby/prod...oducts_id=4041