It's from this pattern:
It was very easy to put together and I didn't have to make many alterations. Instead of interfacing the collar, as it called for; I used two layers of the fabric so it would look better if it happens to blow up. I used an invisible zipper instead of the regular one it called for I did also add a couple of inches in length. Overall....I will certainly make this pattern again if the girls want me to. It's also good for a beginning sewer.