In much of the United States, you can already feel it. There’s a hint of a chill in the night air. The morning light looks somehow more golden. The pumpkin-spice latte has finished its annual transit across the cosmos and returned to its home at your local Starbucks. Sweater weather approaches. Cooler temperatures bring rich textures and many layering opportunities. What this time of year no longer brings to most people, though, is amazing new sweaters. Or even good ones. With apologies for describing a tweet, the comedian Ellory Smith made much the same point a few weeks ago on the platform formerly known as Twitter: With side-by-side photos of Billy Crystal wearing an ivory cable-knit fisherman sweater in 1989’s When Harry Met Sally and the actor Ben Schwartz re-creating the image in a similar outfit, Smith sounded an alarm: “The quality of sweaters has declined so greatly in the last twenty years that I think it genuinely necessitates a national conversation.” Her tweet racked up a couple hundred thousand likes because she’s exactly right. …