I love wearing band tees but my two biggest problems are fitting them (I'm big and fairly busty so babydoll shirts never fit) and the high collars. I'd had this shirt for a few years and never seemed to wear it so revamped it.
I cut the ends off the sleeves, trimmed a few inches off the bottom and cut a scoop out of the neck. I also cut out the heartagram from the back of the neck.

Then I pleated and stitched some black fabric and a piece of tulle underneath to make the skirt. I also stitched the heartagram under the tulle so you can see it without it disrupting the fall of the skirt.

Finally I implemented my favourite toy and ran two seams down the back and punched eyelet holes into them and threaded blue ribbon through. This is my favourite trick when I buy something and it looks cool but gives me no shape. Hope you enjoy!