Found this idea from Generation T. It's actually my very first DIY/Recon project and I'd have to say that the simplicity of it just took my interets and I thought I'd give it a try. Cool idea.
Already posted but noooow its a how-to
Perfect for men's t's, concert tops or anything that you want to make look more feminine
You don't want your bra straps to show under your halter, and you defently don't want to go without a bra!
A chic, sweetheart-cut halter top w/ bow detail on back
Large Baseball T Converted into Cute Halter
an old t shirt turned into a cute halter top