My good friend Shae stenciled this fantastic "Covered in Bees" t-shirt for me. She knew it would be too big and sent it with her crafty blessings to be reconstructed however I saw fit.
Resizing tees is the recon I do most often, making my shirts fit me better while still being long (and wide!) enough to go over my hips.
Use a favorite shirt that you already love the fit of and that has similar stretch to the fabric for your template.
This is a fairly easy recon and usually takes about 30 minutes from start to finish.
UPDATE! I now have a video version of the entire tutorial...
After stitching the sleeves, fold shirt in half, right sides together, matching the bottom hem. Stitch a 1/2" seam under the sleeve and all the way down the side. Trim seam allowance, if you wish.
Because you leave the original hems for the sleeves and the shirt in place, the reconstruction is now complete!