I made the shirt from an extra large plain t-shirt I had in my sewing stash and some sweet trim I got from the thrift store awhile ago. I got the basic idea from a shirt I already own and love and modified it to be a longer, tunic-style shirt with cap sleeves.
Here is a close-up of the pretty, pretty trimming. I heart it.
The trim that goes around the waist is only attached to the front center and then ties in the back. Like so: