The SB is a single-breasted tailored jacket. It has a two-button front, a slightly nipped waist, and a just-barely peaked lapel of moderate size. There's very little structure to be found here — it is foremost a light and casual jacket — but it has the proportions and the silhouette of a smart suit or sports jacket.
The buttons on the jacket are horn, and are light matte tortoiseshell in colour. Being as they are an entirely natural thing, each looks different to the next, varying in tone and hue and striatic markings.
There are three buttons at the cuff, with the buttonholes cut open. It is a working cuff, in other words, though has no quarrel whatsoever with cuffs that cannot work or do not work.
At the front of the jacket are two large patch pockets, which are strengthened with bar-tacks at the top corners. At the chest, meanwhile, on the left side as worn, there's another pocket — most notable for being a somewhat unorthdox upturned flap, and its corners, too, strengthened with little bar-tacks.
Some hand-sewing here. The chain-stitch below the button-hole helps hold in place a boutonnière (a flower, for instance). The criss-cross ("duck") stitch, meanwhile, holds together the lapel and the collar so that, over time, one doesn't flap around independently of the other. Helpful little hidden handiwork.
The jacket has an in-breast pocket — an internal chest pocket, that is, of the jetted variety — on both the left and right sides.
The jacket has a buggy lining, across the upper back, of smooth, slinky satin. Likewise the sleeves. The jacket thus slides on and off with ease. The lower regions are unlined. This is an unstructured and travel-friendly jacket, after all. The exposed seams are finished cleanly and carefully with cotton binding.
Tremendously earthy, this cloth, but subtle in colouring and smooth in finish, and so staying the right side of smart. It is fine, long-staple linen, mercerised for a sleek look and sanforised to remove shrinkage. It is thick and strong, and creases less than most cottons, let alone crumpled, unkempt linens of stereotype.