The shirt is intended to be worn tucked or untucked. That's both. It has a fitted shape, so when tucked in, it rolls tidily into the trouser — but it is also casual, so when untucked it won't look like you've stepped out in an office shirt. It is a standard length: falling a couple of inches below the belt-line on most people.
The shirt has a spread collar — i.e. a collar that opens at a wide angle at the front. It is soft and unstructured, and its points are slightly rounded off.
The shirt has a front of six horn buttons — each of them, in their own natural way, different from one to the next. Meanwhile, every significant seam on the shirt is what's known as a single-needle, lock-stitch, French seam. They take twice as long as standard seams, but look nicer, wear better, and last longer.
The shirt has a chest pocket, with a narrow section on the inside-edge — for a pen, pencil, or chip fork, say — which is established with a long bar-tack. Bar-tacks also appear at the top corners of the pocket, for great strength, as well as several other parts of the shirt subject to the most wear and tear.
The cuffs of the shirt are unapologetically tight, so the sleeve can't step over the line that is the start of the hand, and they fasten with a single button. The corner of the cuffs is gently curved, echoing the collar.
This is a high-count weave of long-staple linen yarn, most notable maybe for having been given the proverbial once-over in a specialised washing and tumbling process at the mill. It has a dry hand, a rumpled texture akin to freshly laundered laundry, and floats breezily away from the skin.