Jockey David Lopez, pictured, and many other jockeys wear black pants when it rains, because they won't become transparent. They also don't wear them tucked in, so mud and water don't run into their boots. Photo taken at Santa Anita Park racetrack in Arcadia, California, U.S.A. (April 9, 2016) Photo © 2016 Marcie Heacox, all rights reserved. FOR PERSONAL VIEWING OR EDITORIAL PURPOSES ONLY. Contact mheacox87 [at] hotmail.com.