How do I sew an off center slit in a dress skirt without opening a seam? : r SewingForBeginners could this dress be altered to have a slit? : r sewhelp How To Add a Top Stitched Slit To a Dress Or Skirt. Doina Alexei LaDivine CD339 Dress NewYorkDress.com How to add a slit where you dont have a seam. I had made a dress but wanted to add a slit to it once it was done, so didnt have a seam where I could add one easily, so this is the method I used!,