The 14th Brooklyn Regiment left New York on 18 May 1861 (except for Companies I and K, which joined it in July 1861), arriving in Washington, D. C. the next day. It was officially mustered into United States service by General Irwin McDowell on 23 May 1861 and initially served at and near Washington. The typical uniform of a Union Soldier was that of a four-button blue sack coat, light kersey blue wool trousers and a blue cap (bummer, or forage cap). At the beginning of the war both the Union and Confederate armies had a variety of uniforms within their regiments. As the war continued, the Union Army began to standardize the uniform worn by its regiments. By early 1862 most Union regiments were wearing blue. However, Brooklyn paid for and outfitted the 14th Brooklyn throughout the war, keeping them wearing their unique chasseur-style uniform for all three years of their service. The headgear worn by the 14th Brooklyn was a navy blue and red kepi. The top of the cap was covered in dark navy blue and the lower half by a dark red with a band of blue around the bottom of the cap. Upon the front of the cap the regiment had the number '14' and above it was the company designation. On the sides of the caps were New York state buttons holding the chin strap onto the kepi. At the First Battle of Bull Run the 14th were issued havelocks, a white material that fitted over the kepis and had a long piece of cloth that hung down below over the neck. The idea was to catch air and cool the neck of the soldier. The havelocks proved ineffective as headgear, however many were used as bandages on the battlefield. The tunics worn by the 14th Brooklyn were a beautiful combination of red and dark blue adorned with small gold buttons running up and the center of the chest. The tunic was made with a red false vest with 14 buttons closing the vest. Over the false vest was a dark blue shell with 14 buttons on either side of the shell. Some later models of the jacket did away with the false vest and actually sewed the vest into the shell making it a complete jacket. On the jacket were chevrons on the lower arms symbolizing light infantry. Earlier recruits also were issued "Shoulder-Knots" composed of thick red fabric that were attached with thread on one end and a gold button on the other. The trousers worn by the 14th were very similar to that of the Zouave pantaloons, the only difference being that they were not as baggy as the Zouave pantaloons.