Step by Step Tutorial for Making a Slit in a Dress or Long Skirt ehow How To Add a Top Stitched Slit To a Dress Or Skirt. Doina Alexei Breeze Into Summer Elegance This ocean inspired floral gown captures the essence of tropical luxury. With a deep slit, delicate straps, and side cut outs it's made for bold boutique collections. How do I add a slit to my dress? I have the same pattern as this person but they edited it a bit : r sewing