With our typical 30-40 F day to night temp swings here, I've learned to layer and carry a light jacket, and use some form of scarf, shemagh or whatever in the breezy cool times. Take today, 77F high, 47 F low, and breezy.I have moved to wearing a vest here in seattle. Rain or no rain. Keep the core warm, the body will do the rest. I'll take a xxl large vest