A pencil skirt is a form-fitting garment that usually falls to the knee or just below for a professional setting. It looks great no matter your height or body type. The figure hugging nature also makes you look more sexy and fashion.
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.