Here's Rayyan's skirt from this outfit, its a long dark blue godet skirt, it could be denim but I'm not sure.
Here's a good option:
Here's some other fun options from Coldwater Creek, both 35" long so if you are tall these are not for you. Take one of your skirts in this a-line shape and check that 35" would be long enough for you.
Piecework Skirt US$29.99
Batik-look print skirt US$29.99