From Laughing Moon Mercantile. Their description reads as follows:
Men's Sack Jackets: Single Breasted, Double Breasted, and Norfolk Versions-approximately 1860 to 1900.
View A is a single breasted Sack Jacket with a two piece back, side back seams, a single breasted front with a dart
under the arm. As shown it has a welt breast pocket, a flap ticket pocket on the right side and two flap pockets. The
front is curved at the bottom and buttons high at the neck. The sleeves are two piece. The jacket is fully lined and has an internal breast pocket. View B is different from View A in the front and collar, the rest of the pieces are the same.
The front is double breasted with a flap breast pocket and six buttons. View C is a Norfolk version that is different from View A in several respects. The front is called a "forward lounge" shape because it does not have a curved front at the bottom. It has applied pleats front and back, patch pockets, and a separate belt.
Fabric: Wool-Plain weave, striped, checked, tweed, houndstooth, novelty weave. Linen or seersucker.
Lining: Period is silk twill, silk satin, polished cotton. Modem is polyester. Pocketing is any sturdy cotton. Sleeve lining is traditionally white fabric with small width
stripes in colors. Interfacing: Fusible hair canvas for the front, fusible knit for the rest. Fusible stay tape. View A
Notions: Four 3/4" buttons, four 1/2" buttons. View B Notions: Six 3/4" buttons, four 1/2" buttons. View C Notions:
Eight 3/4" buttons (traditionally leather), four 1/2" buttons.