No Sew, Tee-Shirt Halter. Pro: quick, easy, cheap, clear instructions, cute, great up cycle project. Con: the knots in the back of the shirt are too bulky for my taste. Verdict: worth a try. Cost of the shirt was $2 at the thrift store. My husband won't let me cut up any of his shirts. Otherwise this would have been a free project.
DIY Tee Shirt to No Sew Tied Halter Top Tutorial from Wobisobi here. Really easy and would make a cute running shirt with a neon sports bra