In "Citizen of Nowhere on a Brexit Farewell Tour", I pointed at the blog entry "'Military' Box Pleats" by Matthew A. C. Newsome. Near the top of this post, Matthew writes that for fourteen years he worked at the Scottish Tartans Museum, educating the public about the kilt both historical and modern. In view of such experience, Matthew's diagrams showing how pleats change and overlap as you add cloth ought to interest anyone making a pleated garment. Especially if the pleats are being used to add warmth as well as for show.
Matthew's blog is on Blogger, a blogging system owned by Google. Unfortunately, Google seems to have a habit of closing projects. There are users who were extremely annoyed when it closed down its newsreader, Google Reader. So, just in case Blogger eventually goes the same way, I've archived Matthew's post in the Wayback Machine. I urge you to do the same with any web pages you value. Including mine.