Where can I find a grey maxi skirt?

I'm looking for a full (not tube) dark grey (sortof marl) jersey maxi skirt. Preferably like this one http://www.asos.com/Asos/Asos-Full-Maxi-Skirt/Prod/pgeproduct.aspx?iid=1496576&cid=2639&Rf127=1408&sh=0&pge=0&pgesize=20&sort=-1&clr=Blue