Darrowby (named in tribute to James Herriot and the bleak winters of North Yorkshire - sheep country, after all) is a lot of sweater. Knitted to a relatively dense gauge for its grist, it works either as a jacket for merely chilly weather or as a powerful insulating layer against serious cold and wind. Knitting it just a little more loosely (same knitting gauge, that is, but in a yarn spun slightly finer) translates thermal armor into soft cozy drape; your call.

Size
XS [S, M, L, 1X, 2X, 3X]
(To fit bust circumference of 30[34, 38, 42, 46, 50, 54] inches)

FINISHED MEASUREMENTS
Chest: 34[38, 42, 46, 50, 54, 58] inches
Length: 26[27, 28, 29, 30, 31, 32] inches
Note on fit: The sizing reflects a generous amount of ease, allowing for one or more layers to be worn underneath. Assume a good 4 inches difference between body and garment; thus, the Medium size will hang about right over a 38-inch bust.

Knit Picks Wool of the Andes [100% Peruvian Highland wool, 110 yd per 1.75 oz skein]; color: Onyx Heather or Cobblestone Heather, 14[15, 18, 18, 21, 22, 24] skeins;

Cascade Yarns 220 [100% Peruvian wool, 220 yd per 3.5 oz skein]; color: 8400, 7[8, 9, 9, 11, 11, 12] skeins.

Raw sheep fleece, preferably something substantial like Romney, 4-5 pounds. Optional: silk top for blending, 7-10 ounces.

Commercial carded fiber in a comparable blend, at least 30[33, 36, 38, 43, 45, 50] ounces.

Finished Yarn:
Wraps per inch: 15
Ply: 4
Drafting Method: Modified Long-Draw
Angle of twist: 35-40 degrees
Yardage used: 1520[1620, 1879, 1959, 2239, 2399, 2639]

Update @ 12-20-2012:

There is a KAL thread here, and this among other things is where you’ll find the most current notes on errata; linked in the page header for easy reference. I’m also sending corrections to Knitty, but the KAL thread is pretty much the best hottest straightest dope.