No, this is not another reference to Silk in Warfare. Shot silk is a specific effect which is created when the warp threads are one color and the weft threads are a second, complimentary or contrasting color. Most commonly found in Taffeta’s, shot silks require a bit of forethought to manufacture.
Now, the reason for the forethought isn’t just what colors do I want to use. Typically, when a length of fabric is woven, the looms do their job, and the end product is then dip dyed in a large vat, to produce an all over color. Or in cases of calico prints, they’ll be sent through the printers to have the design printed on them. But in shot silk, the threads must be dyed before weaving can commence. This requires calculation at the manufacturers end. How much thread will actually be needed in each color to make the ordered yardage. And then that much thread must be dyed in separate vats, then placed in mordants for the dyes to set.
Then the weaving commences. The result is pure iridescence.
Today this effect is called shot silk. However, historically it has been called changeant, changeable silk, and shadow silk. Now, this effect is by no means a 21st century innovation. The wikipedia article on shot silk reports a 12th century description of liturgical vestments from the 7th century of purple and yellow. So this technique dates back to the middle ages, at least to the 12th century, and as far back as the 7th, if the article is described accurately from that time.
It was unquestionably fashionable in the 19th century, as shown in this image from The Met.
And there is reference to changeante silk throughout many books on 18th century dress. I suspect that much like all things, the trend comes and goes. So while shot silk is referenced in the 12th century clergy wear, it’s popularity waxed and waned over the intervening centuries, sometimes en vogue, sometimes not. Such are the vagaries of haute couture. As Heidi Klum would say, one day you’re in, the next, you’re out. Auf Wiedersehen!