Multisized, Army Issue (38-44), or Big & Tall (46-54)
The pattern matches the measurements of the U.S. Army correspondence of 1812 describing the size No. 2 of the Linen Jacket with Sleeves. The sizes No. 1 [38], No. 3 [42], and No. 4 [44] are extrapolated from the No. 2 [40]. A bonus with the U.S. Army issued sizes is an adjusted pattern for the modern man needing a larger armhole.
The Big & Tall sized pattern begins where the U.S. Army issued sizes stop. It also has the larger armhole. The chest sizes are 46" through 54".
Of 58 inch wool cloth the jacket: Sizes 1 requires 1-5/8 Yds.; 2 requires 1-2/3 Yds.; 3 requires 1-3/4 Yds.; 4 requires 1-7/8. Of 45 inch wool or linen Sizes 1 requires 2-1/8 Yds.; 2 requires 2-1/3 Yds.; 3 requires 2-1/2 Yds.; 4 requires 2-5/8 Yds.
NOTIONS: 3/8 Yd. 45" wide pocketing fabric