Hello,
I am not an expert in this. I offered to create a t-shirt memory quilt for a good friend. I used a very firm iron on stabilizer. It was ok, but probably not as soft and cozy as I would have prefered. Recently, I have been making t-shirts tote bags.
I have been using "Pellon Fusible Interfacing" I purchased from Hancock Fabrics. The package is only .77 and has 3 yards of 15" of the interfacing. Since it isn't so stiff, the quilt/tote bags stay soft. I prefer to iron from the back. I found that if I ironed the interfacing to the shirt from the front of the shirt, sometimes the ink would spread to other parts of the shirts. Thus making a mess.
I have attached a picture of the quilt and one tote bag. Hope this is helpful. Good Luck, but have fun!
Karen