A kind of course wollen cloth sold at Dupui's general store only in the early days (1743 and 1744), kersey was of a lighter weight than broadcloth but had a strong reputation for warmth.

Kersey yarns were thickly spun from inferior carded wool, and made a cloth both thick and sturdy.  The fabric was a warp-backed, twill-weave cloth woven on a four-treadle loom.  The back of the cloth was napped and shorn after fulling, producing a dense, warm fabric with a smooth back.

In terms of economic value, while kersey was routinely priced between 8 to 10 shillings per yard (compared to broadcloth at 16 to 18 shillings per yard), kersey was typically sold in 1-yard-wide rolls while broadcloth was sold as a 2-yard-wide fabric -- hence, the relative cost was almost identical.  At Dupui's general store, sales of broadcloth, however, outpaced sales of kersey (by 2 to 1), during the same time period. 

Apparently, fashioning a garment from broadcloth was substantially easier than working with kersey.  Further, as woolens could be itchy, it comes as no surprise that purchases of kersey were also accompanied by purchases of a shalloon liner fabric. This, of course, added another two and a half shillings to the project... and as the broadcloth option never required a lining, one can readily see why broadcloth sales rapidly outpaced sales of kersey.