This photograph is of future president Theodore Roosevelt posing in his Rough Rider uniform during the Spanish-American War. It was taken in 1898 by Siegel, Cooper & Co. His uniform was custom-made by the American clothing brand Brooks Brothers. Roosevelt wore a slouch hat, a hat style popular for military uniforms since the Civil War. Rough Rider uniforms also included a loosely tied blue bandana, cartridge belt, long gloves, and boots. This rugged look captured the adventurous, frontier spirit Roosevelt aspired to, and that earned the group the nickname, the “Rough Riders” though officially known as the 1st Volunteer Cavalry. A former governor of New York, Roosevelt became president upon the assassination of William McKinley on September 14, 1901, and served until March 4, 1909.