In his book “Recollections of a Confederate Staff Officer”, Gilbert Moxley Sorrel served on the staff of General James Longstreet. In the book he describes the preferred uniform standards for Confederate officers. But due to the fact that the South was limited in resources due to the Union blockade and cost was a factor there was a more varied difference in uniform cut and color.
“For all officers, a close-fitting double-breasted gray tunic. For generals, staff and all field officers, dark blue trousers.
The arm of service was shown by collar and cuff— Generals and staff officers, buff; Cavalry, yellow; Artillery, red; Infantry, blue; Medical Department, black. Dark blue trousers had broad gold stripes on outer seams, except generals, who wore two narrower and slightly apart.
Trousers for all line officers under rank of major were light blue with broad cloth stripe, color of service arm. Rank was shown on collar and sleeve. Generals wore on collar a gold wreath enclosing three stars in line, the middle one slightly larger.
On their sleeves was the ornamental Hungarian knot of four braids width. They usually wore their buttons in groups of twos or threes. There was no difference in the uniform or rank mark among the several grades of general officers. Colonels wore three stars in line, same size; lieutenant-colonels, two, and majors, one. The knot on the sleeve was three braids width for the three grades of field officers—colonel, lieutenant-colonel, and major.
For captains, rank was shown by three short bars lateral on front of collar; first lieutenant, two bars, and second lieutenant, one bar. Captains wore on sleeve Hungarian knot of two braids width, and first and second lieutenants, one braid. For headgear the French “Kepi,” color of arm of service, richly embroidered, was first provided; but the felt hat, black or any color that could be had, speedily pushed it aside almost before it had an existence.”