A great take on the formula, and looks perfectly in tune with your style. I like the dark hosiery, and I would also like it without when it's warmer. Navy tall socks might work, too, if you had a non-black top and didn't want something so heavy below.
The nude knee highs work well with temps in the 40s and 50s, IF the weather has been consistently thus so the ground and air don't feel "icy" (if that makes sense). Some areas only get that weather in fall/spring -- but the PNW gets plenty of that weather in winter, so it makes sense to wear here! I'm wearing some today.
(Hah I have the complete opposite of your hair Vivian, chronically messy )