Continuing to move backwards in the history of US Army uniforms:
Union and Confederate Armies 1861-1865
first line (Union): lieutenant general undress, brigadier general full dress, colonel of infantry full dress, captain of artillery full dress, major of cavalry full dress, lieutenant colonel of the medical corps officers overcoat with staff trousers
second line (Union): sergeant major of artillery full dress, sergeant of infantry full dress, private of infantry fatigue marching order, corporal of cavalry full dress, private of light artillery full dress, great coat for all mounted men
third line (Confederate): general, colonel of infantry, colonel of engineers, major of cavalry, surgeon major of the medical department, captain of artillery
fourth line (Confederate): first lieutenant of infantry, sergeant of cavalry, corporal of artillery, private of infantry, infantryman with overcoat, cavalry trooper with overcoat
*As I understand it, many of the Confederate uniforms displayed here (especially for the lower ranks) are only theoretical as the Confederate government never had the resources to procure standard uniforms for the entirety of the army and officers purchased their own uniforms. As you can imagine, they were quite a ragtag looking bunch, but they fought very well nonetheless.