I’ve made one tee shirt quilt, I used both the front and back of the shirts. I cut around the neck, down the sides and cut out the sleeves, now with two pieces I stabilized each. I planned 16” blocks cut out the design then added colors from other shirt backs to form a block. For the border I did a solid cotton 2” then pieced6”x 2 1/2 strips together from the tee shirts for the next border then finished with a 4 “ solid.