Hi Saira,
I finally got around to buying my wife another one of the Double Serge Heather Graphite skirts
http://www.jcrew.com/womens_feature/NewArrivals/dresses/PRD~03216/03216.jsp. I had already bought this for her in a size 10 regular and tall (for the added length), but when she wore the regular pencil skirt with a pair of her taller black leather knee high heel dress boots (shown below), while still looking good coming down to the tops (as the skirt is 23 1/2 inches), I thought about trying her it with the 21 1/2 to go with the boots. Per your recommendation, I went on ahead with ordering her a size 12 Petite so that the fit should be the same in the waiste, but for a few inches shorter on the skirt. If it works well for her, I will buy her a black double serge one too like this. Thank you for the advice. It arrives today, so should give an indication of how well this will look. Thank you! LiveFire