This is an item I pinned and thought was so cute, I had to knit it up. The instructions were in French, but searching around a bit I found a translation. I was so glad.
Tyler came to our house as I was finishing sewing the buttons on, so he had a pic in it. He is a large 4 months, so you can see how roomy it is.
I did add about 3" to the length. I wanted to make sure it had plenty of room.
You can find all the details of the pattern and yarn at my Ravelry site.