Hello- hat feathers were not uniform items for British soldiers during the AWI and the evidence is sketchy for what was worn- leaving to one side the legends that have taken root down the years.
The most reliable reference, a contemporary letter from December 1779 refers to the two flank battalions in New York, and describes the LI wearing green feathers in their caps while the Grenadier battalion wore white feathers in their hats.
IIRR, the LI Bn at that date consisted of light coys of 7th, 17th, 22nd, 33rd, 35th, 37th, 42nd, 54th, 63rd?,70th, 74th.
There is a more problematic reference, written almost 50 years after the event by a retired officer who was a quartermaster at the time, to the three/four grenadier battalions wearing white feathers, the 1st LI Bn green and the 2nd LI Bn red, but without reference to the nature of headgear (No mention of the 3rd LI Bn). That appears to relate to circa 1776- but the account is contradictory in its details, its main purpose to explain the origin of the 42nd RHR 'red feather' ordered by Gen Howe at that time 'to make the whole uniform.'
As far as I am aware, this is the only textual reference to red hat feathers being worn by British infantry during the AWI.
However, there is also a very late quartermaster entry from 1783 that shows that the LI company of the 71st Regiment (Fraser's Highlanders) had been wearing a red feather among the black feathers in their bonnet. For what it's worth, the 71st light coy had formerly been with the 2nd LI bn under Major John Maitland, subsequently CO of the 71st in the south.
The two della Gatta paintings of the attack at Paoli Tavern and the battle of Germantown (painted circa 1785) show the 2nd LI bn wearing mainly black feathers in their hats. Most identifiable figures represent men from the 52nd Regt's light company.
St George of the 52nd drew cartoons in 1777 depicting himself and others members of 2nd LI Bn together with an officer of 1st Grenadier Bn all wearing black hat feathers.
As far as I am aware the only evidence for battalion companies wearing hat feathers comes from Della gatta's Germantown picture. The companies of the 40th filing into the Chew house are shown wearing 'what appear to be brownish-red ostrich plumes in their hats'(Stephen Gilbert). One officer of the 40th wears two tall black feathers; another, a single, tall red and white plume.
See: Stephen R. Gilbert, An Analysis of the Xavier della Gatta Paintings of the Battles of Paoli and Germantown, 1777, Military Collector & Historian:
part I, VOL 46 (Fall 1994), 98-108;
part II, VOL 47 (Winter 1995), 146-162
Hat feathers remained non-regulation until the 1790s and it wasn't until 1800 that the system of white over red for battalion coys, white for grenadiers (and fusiliers) green for light infantry (and rifles) was finally established- with one or two notorious exceptions.