Since I didn't use a pattern I had a hard time getting it to fit properly. It is still a little tight in the chest. I might still adjust it a little bit to make it looser.
The hardest part was sewing the zipper in with out having it show too much. I had a different zipper at first that was kind of light blue but it showed really badly. When I tried to get it not to show I somehow got it stuck and ended up breaking the zipper trying to get it up. It took forever to rip out the old zipper but I managed to get this dark blue one in without it showing too much. Still not perfect, especially at the bottom, but much better.