It didn't necessary have meaning - it just gave them a color which distinguished them from Union forces.
Their uniforms were grey.
Confederate uniforms, gray wool uniforms
Their uniforms were gray. If needed...the Confederate flag had a red background with a blue X across it outlined in white. The uniforms of the Confederacy were gray. Their flag was red, white, and blue.
Confederate uniforms were grey. The Union Army wore dark blue.
Union uniforms were blue; Confederate uniforms were gray.
wool
At the beginning of the US Civil War, some of the the Confederate army uniforms were a butternut color. Grey was introduced as soon as these color uniforms could be produced. The US army already had blue uniforms and remained with that color.
Grey. At the war's first battle (Bull Run/Manassas), one Confederate unit was wearing blue, and managed to capture a couiple of Union batteries, because the gunners thought they were friend not foe.
The Southern (Confederate) Army wore grey uniforms.
uniforms are gray and blue,red and blue
gray uinforms
they were made by wood.