Confederate Blue and Yankee Grey

This South Carolina rifleman wears a leather Albert shako and frock coat with epaulettes similar to the uniform of the USMC. The other enlisted man has red piping and a "birdcage" on the front of his coat, marking him out as a musician (most likely a bugler)

Zouave from the 11th Indiana in grey uniform

The same Zouaves in campaign dress. Note the shield-fronted John Wayne-type shirt worn as an unofficial uniform early in the war

Uniform of the Massachusetts Independent Corps of Cadets worn at Shiloh
Link

Uniform of a US artillery regiment, the Excelsior National Guard from New York

To quote Alan Farmer, Johnny Reb's greatcoat, boots, pants and blanket were made by Uncle Sam. It was common practise to strip the bodies of dead Yankees to replace worn-out kit. As many Yanks replaced their regulation kepis with slouch hats, it would be very difficult to determine the allegiance of the Reb in the center were it not for his battle flag and grey-clad buddies

Some late war confederate uniforms were such a dark shade of grey they were almost black. Officers tried to stop the men from wearing sky blue trousers out of fear they would be shot by their own side

Here's an interesting site with photos of Washington Artillery uniforms, including a French-style frock coat in use during the Mexican War

Edited by Nick1986 - 03-Feb-2012 at 15:54

Soldier from the 96th Illinois still wears the pre-war grey coat, but has replaced the trousers with federal blue
http://lakecountyhistory.blogspot.com/2010/07/civil-war-and-tale-of-two-henrys.html