I know you've been holding on to those beloved concert T's just knowing that they'd be good for something... The New & Improved Rockin’ Baby Gown Tutorial with Hand Flaps! Tutorial is courtesy of Carrie at Thismamamakesstuff.com. While you are there you should check out some of her other tutorials and clothing refashions. She's oh so talented and I often find myself reading her blog for inspiration!
Here's how mine turned out (please excuse the sub par photography)!