Cotton in its various forms of textiles was a very common item throughout North America in
@brazosland time frame.
For commercial usage it was imported to the US from China, England and France until around 1825 when viable domestic commercial production began to replace imports.
The HBC post Nottingham House stocked Duck and Cotton trousers in 1802-1806.
NWC orders for 1802-1807 have recurring requests for stripped cotton, and blue nankeen (cotton) trousers.
McKenzie while on the upper Missouri in 1804-1805 encountered the Gros Ventres and stated "We observed a great change in their dress...viz., Russia Sheeting trousers, swan down vests, corduroy jackets, calico shirts, etc. all resembling Canadian Voyageurs clothing...". After repeated enquiry the Gros Ventres said they had been at war with the Blackfeet and taken it from them.
[where did the Blackfeet get them?]
In 1808 an American by the name of Jacob Perkins developed a method that completely mechanized calico printing that was increasingly used by the textile industry, both in the US and abroad, from 1810 onward.
The Germantown Historical Society has a pair of Cotton Knee breeches from 1812.
Winterthur, Bequest of Henry Francis duPont, has a pair of Cotton corduroy breeches circa 1775-1810.
Calico was a popular shirt material in colonial times. In 1766 Baynton, Wharton, & Morgan of Philadelphia were sending calico shirts for the Illinois trade. In 1771 they sent "Callicoes with large red, blue or purple flowers" to the same place.
What was to become the Office of Indian Trade in 1806, began purchasing Calico for indian trade in 1796.
There is a vast amount of documentation on this for those that want to chase it down.
I could go on and on but suffice to say that the amount of Calico and other Cotton based textiles in the US and Canada in the late 1700's and early 1800's was huge. Everyone was wearing something made from cotton, including the Indians that had access to either Traders or Forts as they preferred textiles over skins for clothing- they even started using it for their dwellings in place of hides. HBC and the OIT provided cotton textiles for just this purpose.