I was walking through the arts-and-crafts store over the weekend, wandering down the upholstery aisle, admiring printed fabrics and wondering if I had anything that needed a facelift. I didn’t. But as I wandered, looking at all the various hardware and interesting devices, my eye fell on pleat hooks. Pleat hooks? you ask quizzically. Or maybe you know. Yes, I answer enthusiastically. Pleat hooks.