I got this at the grocery store, of all places. The tag said "sundresses/swimsuit cover-ups." My cover-up does a lot more covering up, and this was way too short to wear as a dress. It was also see-through. But I liked the polka dots, so I decided to make it into a shirt.
It had elastic smocking at the top that I removed, and it gave me a ton of extra fabric to work with. Basically I made a tube, shirred the sides, and made straps out of the excess. I can now wear this without any special bra, which is nice.