Zouave Craze, 4th Michigan Infantry.
Title: Portrait of Private Richard L. Cramer, who served in the Union Army as part of Company I, 4th Michigan Infantry, and Company A, 1st Michigan Cavalry; photographed by Matthew Brady, 1861 [1113×1378]
Source: https://reddit.com/r/HistoryPorn/comments/l6vzoz/portrait_of_private_richard_l_cramer_who_served/