My suggestion is that if you find a skirt you really like with a slit on the wrong side just sew that side up and seam rip the other side and just turn under the fabric and sew that up so it won't fray.
Or I made this
you could modify it by putting the gathered/longer material on the left side and making the other side shorter etc.
(I will put in a post this weekend of this pattern in the pattern review. Oh and the pattern looks kinda dorky on the package but I really like how the skirt turned out.)
Edited to say: you could ask shade and shadow in her link to draft a pattern for you since she offered.