I’ve gotten a new project to work on! A dear friend of mine asked me to make a memory shirt out of her late husband’s shirts. I cannot wait to dive in, but I have a question for all of my fellow sewists: How should I stabilize the shirts so that when I cut them I get proper squares, and they stay that way? So far I have 2 ideas about what to do: use iron on embroidery stabilizer, or use iron on batting and use quilt as I go method. Anyone know what else I can do? I really want to make it awesome!
Eric The Quilter 
I use Pellon 906F fusible sheerweight and it works wonderful.
Why main question is, can I sew fast with that interfacing, or will it break my thread if I sew too fast?
Joanns carrys a fusable material that u put on the back of the t-shirt so it stays in place, i forget what its called but if u go there and talk to someone there that is cutting material thay will tell you , I know because my daughter asked me to do a t-shirt with my grand daughters soccer t-shirts, good luck