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.
(the baggier the shirt, the longer the Put on T-Shirt without putting your arms in the sleeves. Tuck the sleeves into the T-Shirt. Wear your DIY no-sew dress! Could wear with an adorable sleevless jean jacket!