Late November, right after Thanksgiving, is my favorite time to go to WDW! I am from upstate New York, so I don’t know if that tends to be colder or warmer than Colorado. But they’re both colder than Florida!
I generally wear jeans or cargo shorts and a t-shirt, and bring a fleece hoodie. Sometimes it’s cool enough to wear the hoodie during the day and not be too warm, but if it is I just tie it around my waist. It tends to be chilly enough after dark that I’m really glad to have it with me.
Similarly, there are occasionally times when the shorts may be a teeny bit cool for nights or the jeans a smidge too warm for midday, but not enough to warrant changing.