There are countless contemporary descriptions of southern uniforms being "butternut" and as such has nothing to do with Jarnagin or re-enactors. Butternut was simply that, the dye of a butternut or walnut. Freemantle describes seeing all kinds of colors and hues of grey, tan and butternut.
A contemporary description of 460 captured Confederate officers states, "There among them were tall, lank mountaineers, dark haired and fierce of aspect and a lesser number of city men of jauntier appearance. The major part were common looking, evidentially of the poorer class of Southerners, with a spreading of foreigners, principally Germans and Irish. Hardly any two dressed alike. They wore suits of blue jeans, homespuns of butternut and a few in costumes of grey more or less trimmed........."
Another quote by an unknown Union private at Appomattox, "They were wearied, earnest looking men, wearing butternut and gray colored clothing and broad brimmed hats." After the battle of Five Forks a Union officer depicted the prisoners, "Very few of whom had any semblance of uniform. It was a motley group, there being no pretense of uniformity in dress, dirty gray and butternut were the prevailing colors." Another observation on the road leading away from Appomattox, "That very few of whom had any semblance of uniform but were clad in homespun butternut cloth. It was hard to distinguish betwixt the officers and the private, as they were all dressed alike"
A correspondent for Harpers Weekly commented on the appearance of Lee's army at Sharpsburg, "With the exception of their officers, there was little but homespun among them, light drab gray or butternut color........"
Stonewall Jackson was quoted as saying his Corps were "wearing dusty brown homespun, coarse slate colored garments, in fact all varieties of uniforms and every shape form and apology for hats and shoes."
We need to dispense with the "Butternut Myth" and call it what it was called, butternut, tan or brown.