So taking on the advice of many. I kept this as a dress. I separated the tent like dress into a bodice and skirt. Added front and back waist darts. And took the side seams in by 1 inch on both front and back. I then recut the skirt to fit the bodice. Evened the length as it was originally longer at the back. Once the skirt was attached I added a side zip. This is the most unsuccessful part and I think I'll change the regular zip for an invisible one.