The Giza Cotton Shirt.

Giza is not a brand and it is not a thread count. It is a set of cotton varieties, each carrying a number, grown in the Nile Delta where the soil and the long dry season produce unusual fibre length. The extra-long-staple grades that reach fine shirting are Giza 45, 87, 88, 92, 93 and 96, and of those, 45 and 87 are the ones the trade treats as the top of the market.

The number that matters is staple length. A Giza 45 fibre runs to roughly 36 millimetres, with a uniformity index close to ninety per cent — meaning not only that the fibres are long, but that they are reliably the same length as one another. Ordinary upland cotton sits well short of that.

It is worth saying plainly what the word does not guarantee. Egyptian cotton on a label is close to meaningless on its own; it is used loosely and often dishonestly. A named Giza grade woven by a mill willing to put its own name on the selvedge beside it is a different proposition, and that is the only form in which we buy it.

Three consequences follow from a longer fibre, and all three are things you notice on the body rather than on paper.

It spins finer at the same strength. A long fibre needs fewer twists to hold together, so the yarn can be made thin without becoming fragile. That is how a cloth gets to be light and still survive being worn weekly for years.

The surface is smoother. Short fibres leave ends sticking out of the yarn; long ones do not. Fewer protruding ends means less friction against the skin, and far less pilling at the two places every shirt fails first — the collar fold and the inside of the cuff.

It holds light and colour. A smooth surface reflects light evenly, which produces the soft lustre of a good cotton shirt without any finishing treatment. The same smoothness holds dye more evenly, so a navy stays navy instead of drifting grey.

We will be honest about where this belongs. For an open-collar shirt worn outdoors in April, our lightest voiles beat it, because at that point sheer weight is the whole argument.

Where Giza earns its place is the shirt worn under a jacket, in an air-conditioned office, several days a week, for years. That shirt is judged on how it looks at seven in the evening and how it looks after fifty washes, and on both counts a long-staple cotton is simply better. The cloth comes out of the wash flatter, takes an iron cleanly, and does not develop the dull fuzz that finishes off a cheaper shirt in a season.

We keep Giza quality cloth in plain grounds and in woven stripes — navy with fine white cords, and navy with a wider tan bar. Our Söktaş pieces are the ones we open most often, from a Turkish mill that grows a good deal of its own cotton.

A first shirt commission takes your measurements, a collar and cuff decision, and one fitting. We normally suggest starting with two — a plain and a stripe in the same cloth — because the second is where you learn what you actually want changed. See also the striped shirt and Sea Island cotton, the one cotton that sits above this.