The Modefywear manufacturing facility, which produces its own clothing line as well as lines for dozens of other designers and small businesses, is seeing an overall shift toward lighter fabrics, according to Scott. That doesn’t mean there’s less focus on fall clothing this time of year, but it might look a little different from the fashion of a generation ago.

“Warm weather means fall has arrived, the season has changed,” Scott said. “You think about darker clothing, and we still have that, but now it’s more cotton, spandex and polyester.”

There may be no official definition of “sweater weather,” but most consider it to be when temperatures fall between 55 and 65 F, depending on a Weather Channel investigation. But it’s not just a question of temperature; the amount of cloudiness, sun, and rain also influences how people choose to dress on a given day.

In general, it’s fair to say that most places in the United States experience “sweater temperature” days in the fall, but the frequency varies greatly by region. For example, in 2023, 55% of U.S. counties had an average temperature below 60 F on at least half of their fall days.

When it comes to certain spending habits, the more things change, the more they stay the same, Haley Brennan told Stacker. She has worked for a mix of small clothing boutiques and large retailers. She describes herself as a microinfluencer with a fashion and lifestyle blog called Haley’s Life in Color.

“People always seem to be drawn to sweaters, coats and diapers. It seems like when something is cute, it’s cute, no matter the weather,” Brennan said in a text. “Sweater weather, to me, used to mean those chilly fall days when you can finally break out your chunkiest knits, but you don’t yet need a full coat on top. Unfortunately, with change climatic, these days seem rare and distant between.