A friend of mine made a quilt just like that. Her daughter had so many Tshirt, she had to make two sides to use them all. Not a very experienced seamstress or quilt maker, she didn't know any different. She used an old comforter in the middle and blue sashing between the shirts. She tied it because it was so thick. It was very large and very heavy but her daughter loved it and that's all that matters. I think the quilt as you method would work too.