This has been discussed a bunch in earlier threads and worth saying again, many people have brought up the common fact that teenagers tend to underdress for cold weather. They never seem to want to wear coats for whatever reason. Sit in a high school parking lot even when there's snow in the ground and marvel at how many kids come out without a jacket.
But beyond that, as someone who is also from the Midwest and used to the often wildly variable weather from one day to the next, if I'm not mistaken this particular day the crime occurred was unseasonably warm for the area. Maybe 50 degrees? I don't recall but I can tell you any time this part of the country hits 45-60ish degrees you'll see a wide variance in how folks are dressed. I know folks who get out their shorts for 50 degree weather (literally had someone announce this to me last week) and there's something about hitting a warmer day in the winter that makes that day feel extra warm (versus those first cooler days in the fall. Temp may be the same in both but how people dress is different). I'm kind of rambling but really, this winter has been a strange one here in the Midwest (I just saw Chicago has had no substantial snowfall all of Jan and Feb for the first time in the 100+ years they've been tracking snow fall totals and recording them). So seeing people dressed a wide range of ways for the weather isn't so unusual at all. If you leave in the morning you might have a warm coat, hat, and gloves only to leave work or whatever and it's 20-30 degrees warmer now.
So between the weird weather and the fact that kids are so weird about coats, I don't know that this is such an issue at all. I feel like you could stand on a busy street in any midwestern city right now and see a wide variety of coats or no coats, etc.
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