So I was checking my email and got one from macy's about a great new shoe that's designed to help tone your legs and butt when you walk. I think the black ones would look ok with an abaya no? Haha I'm seriously considering this... with the amount I walk to and from and around malls, I could have an amazing body in no time.. check it out:

A workout in a shoe! The FitFlop sandal tones your calves, thighs and glutes with a specially designed midsole that functions like a mini wobbleboard to engage your muscles as you walk.

http://www1.macys.com/catalog/product/index.ognc?ID=279731&CategoryID=30567&LinkType=EverGreen#