The quality and availability of military flight clothing was a significant concern for American aviators in World War I. The scarcity of supply and lack of standardized flying apparel forced many American pilots to supplement their personal kits with clothing and flying equipment purchased from commercial vendors. Many local companies even produced clothing to military specification, allowing personnel to acquire equipment outside the regular supply chain. This advertisement, an illustrated catalog of military boots and gaiters, was printed by the Sparkes Hall and Co., Ltd. of London. (U.S. Air Force photo)