Disclaimer: This shirt was in a pile that was going to go to the thrift store - please excuse the resulting wrinkles. Since my last attempt to size down/redo a t-shirt seemed to go okay, I decided to rescue this shirt and see if I could bring it back to life. The shirt seemed very boxy to me, which I think was exacerbated by the cap sleeves.
First order of business: remove the cap sleeves. Second order of business: make it fit. Third order of business: add some interest. I hand ruffled the ruffles first, then pinned them on the shirt, then sewed. Simple enough!
Before - frumpy:
After - not so frumpy!: