Wool was the most common fabric for clothes and furnishings, but there is a tremendous difference in types of wool. A discourse on the names and characteristics of wool fabrics of the time is beyond our scope. We will focus on buying fabrics currently available that most resemble historic ones.
Worsted wool was the type most commonly seen in kirtles and petticoats – worsted means that the raw wool has a long thread that has been combed and spun tightly, making a fairly light-weight but firmly woven fabric. You can buy worsted wool today (it is commonly used in men’s suits), but should avoid anything too “shiny” looking.
“Broadcloth” or just “cloth” was a woolen fabric that had been given a great deal of finishing work that brushed the woolen weave to make a nap that was trimmed to an even consistency. You can buy a historic type of 18th century broadcloth from companies making products for re-enactors, like Burnley & Trowbridge (see suppliers list). It is dense material. An in-between option is wool flannel. This is typically twill woven and has a little bit of soft nap to it. This can be a good choice for woolen garments.
The cheapest type of wool and one associated with farmers and country people was “russet.” Today we use that name to mean a rusty orange color, but in this time period it meant an undyed, natural-colored wool, in plain weave, with a somewhat thick and coarse woolen thread. Even better quality people might have a bit of russet in their wardrobe for practical use. Wool dyes well. Although natural “sheep’s color” was common at the lower end of the scale, evidence from wills and probate inventories and similar documents give a pretty good idea of favored colors.
In general, avoid coating wool. It has a lot of filler and is generally too thick for most projects.