Rachel Comey Scarpa Calf Hair Mules in Cognac. - size 6 (also in ) Rachel Comey Scarpa Calf Hair Mules in Cognac. - size 6 (also in ) Dyed calf hair upper with leather sole. Fur Origin: Brazil. Slip-on styling. Heel measures approx 3 H. RCOR-WZ14. 46 102. Former Theory designer Rachel Comey hit the fashion jackpot when Bowie wore one of her shirts during an appearance on The Late Show with David Letterman. Now, several collections and a womenswear line later, Comey?s label has grown far beyond hunky-dory.