I got this interesting shirt with a portrait of central park from the thrift store. I liked it as a shirt and will wear it as both, but here is an easy DIY to sew stretch shirts into a skirt/tube dress.
DIY:
If you like it as a shirt too, you can also just tie the arms around your waist and it becomes a convertible shirt/skirt.
Because it was stretchy, all I did was sew it into a tube...similar to this pencil skirt refashion (
here) but without the zipper and waist band. Turn inside out and pin it to fit. Sew. Trim excess fabric and sleeves.
Even can be worn as a tube top or dress...