Create DIY for this, I guessing you are going to need to use 2 shirts, cut the one you'll wear with the side slits. Then cut strips out of Tshirt, sew into the inside of the first shirt at the top then weave and sew to the bottom of shirt.
I can save the shirt the EMTs cut after our car wreck! "Beautiful touch in a simple shirt. Cut a section of a long sleeve shirt and use fabric glue to hold lace in place. Stitch in various places around the lace, and wash inside out // hang to dry!