The original shirt. It's not nearly that boxy on, but it's definitely needing help in the shape department since it's now technically too big for me.
For now, this is a good fix and it was really easy! Just a piece of elastic on the inside seam--which was my first experience sewing elastic--and other than machine troubles I had (some days my machine seriously hates me), it was super easy and super fast!! I think the first one took me about 10 minutes start to finish and the second one about 30 because that's when my machine started to throw a hissy fit and I had to rip one side out about 3 times!