Here are the references I have to length...
HEADQUARTERS, 6TH VIRGINIA REGT., April, 1776. The Captains of the 6th Battalion, together with the other Officers, are immediately to provide themselves with Hunting Shirts, short and fringed, the men's shirts to be short and plain; the Sergeants' shirts to have a small white Cuffs and plain; the Drummers' shirts to be with dark Cuffs. Both Officers and Soldiers to have Hatts cut round and bound with black; the Brims of their Hatts to be two inches deep and cocked on one side, with a Button and Loop and Cockades, which is to be worn on the left. Neither man nor Officers to do duty in any other uniform. The Officers and Soldiers are to ware their Hair short and as near a like as possible.
By Order Of Mordecai Buckner, Colonel, Commanding
General Orders, 24 July 1776 Head Quarters, New York, July 24th 1776. Parole Virginia. Countersign Wales.
Each Brigadier, with the Colonel and commanding officers of the several Regiments, in his Brigade, are to meet and estimate the quantity of paper, absolutely necessary to serve a Regiment for Returns, and other public Uses for a Month, and make report thereof to the General at Orderly time on Friday next, that the Quarter Master General may be directed to provide & deliver the same Monthly to the Colonels, for the use of their respective regiments.
The General being sensible of the difficulty, and expence of providing Cloaths, of almost any kind, for the Troops, feels an unwillingness to recommend, much more to order, any kind of Uniform, but as it is absolutely necessary that men should have Cloaths and appear decent and tight, he earnestly encourages the use of Hunting Shirts, with long Breeches, made of the same Cloth, Gaiter fashion about the Legs, to all those yet unprovided. No Dress can be had cheaper, nor more convenient, as the Wearer may be cool in warm weather, and warm in cool weather by putting on under-Cloaths which will not change the outward dress, Winter or Summer—Besides which it is a dress justly supposed to carry no small terror to the enemy, who think every such person a complete marksman.
JCC, 5:853–56. The new monthly pay rates for officers were: “a colonel, 75 dollars; lieutenant colonel, 60; major, 50; captain, 40; lieutenant, 27; ensign, 20; quarter master, 27½; adjutant, 40 dollars.” Each soldier’s “suit of cloaths” was to consist “of two linen hunting shirts, two pair of overalls, a leathern or woollen waistcoat with sleeves, one pair of breeches, a hat or leathern cap, two shirts, two pair of hose, and two pair of shoes.” Congress on 8 Oct. also recommended to the states that had regiments in Continental service “at New York, Ticonderoga, or New Jersey, that they forthwith appoint committees to proceed to those places, with full powers to appoint all the officers of the regiments to be raised by their states under the new establishment, that such officers may proceed immediately to inlist such men as are now in the service, and incline to re-inlist during the war, and that such committees be instructed to advise with the general officers, and promote such officers as have distinguished themselves for their abilities, activity, and vigilance in the service, and especially for their attention to military discipline.”
You expressed apprehension that the rifle-dress of General Morgan may be mistaken hereafter for a wagoner’s frock, which he, perhaps wore when on expedition with General Braddock; there is no more resemblance between the two dresses, then between a cloak and a coat; the wagoner’s frock was intended, as a present cartman’s, to cover and protect their other clothes, and is merely a long coarse shirt reaching below the knee; the Dress of the Virginia rifle-men who came to Cambridge in 1775, (among whom was Morgan,) was an elegant loose dress reaching to the middle of the thigh, ornamented with fringes in various parts, and meeting the pantaloons of the same material and color, fringed in a corresponding style…It cost a trifle; the soldier could wash it in any brook he passed; and however worn and ragged and dirty his clothing might be, when this was thrown over it, he was in elegant uniform.
Johnathan Trumball 1836 (Painter with GW camp in 1776 then to Europe)
They have besides a Body of irregulars, or rifle Men, whose dress it is hard to describe. They take a piece of Ticklenburgh, or Tan Cloth that is stout and put it in a Tann Vatt, untill it has the shade of a dry, or fading leaf, they they make a kind of Frock of it reaching down below the knee, open before, with a large Cape, they wrapp it round the tight on a March, & tye it with their Belt in which hangs their Tomahawk, their Hatts as the others, and take their posts, to hit their mark -Silas Deane to Elizabeth Deane, 3 Jun 1775 (Delegate and envoy from Conneticut)
Morgan came with his regiment of riflemen either with Washington or soon after his arrival. The uniform of Morgan’s regiment was a short frock made of pepper and salt
colored cotton cloth like a common working frock worn by our people, except that it was
short and open before, to be tied with strings. Simeon Alexander 1832 Private in 5th PA Regt