The closest resemblance to a cloak is a Moroccan style jallabiyyah. It's got the hood and everything. Put that on over a thawb and you'd be looking like Obi Wan Wanobi. Ask a Moroccan brother in your area for details. They look similar to these (prices are sorta ridiculous, better to get them from overseas): http://www.shukronline.com/hoods.html