Not many Civil War soldiers wore black uniforms. This is the order that came out in 1864 that changed the 1863 regulations uniform for the Union Army Chaplains. General Orders 247 August 25 1864. The Uniform for Chaplains in the Army, prescribed in General Order No 102, November 25,1861, is hereby republished with modifications, as follows: Plain black frock coat with standing collar, one row of nine black buttons on the breast, the "herring bone" of black braid around the buttons and button holes . Plain black pantaloons. Black felt hat, or forage cap with a gold embroidered wreath in front, on black velvet ground, encircling the letters U.S. in silver, old English characters. On Occasion of ceremony, a plain chapeau de bras many be worn. BY ORDER OF THE SECRETARY OF WAR.