I understand that the knit (tricot) fusible stabilizer is a good choice. Since tees stretch east/west, this stabilizer should be fused north/south. I think this will keep the layers together better than having the stretch running the same. When you "fussy cut", be sure to oversize the block by a few inches. When everything is fused, cool and rested, then cut the block to the correct size. And be sure to use a woven fabric for your sashing. This will help w/stretching even if it is only one inch wide. Use sashing to make the block size the same, if you wish. No sashing encourages stretching. Good luck. Let us see your finished project.