I originally ordered the black Silverton in Size 8.5, which has been my normal size for Keen water and trail shoes.  (I am mainly an 8 in all other brand/styles of boots.) Although they looked adorable, my toes were firmly touching in thin wool socks and the boots were obviously too small.  I sent them back and ordered again in the 9.  Both purchases were sold by Heart and Sole, and compliments to them and Amazon for the perfect condition of both sets of boots, packaging, speed of processing and refund, etc.  The 9 fit perfectly and looked great. I swear my feet looked smaller than usual in them, must be due to the shape and the Keen style of the sole coming up over the toe. I can probably get away with a medium-weight sock in the 9, but definitely not a heavy sock. I have narrow calves, and didn't have any trouble wearing over pants.  I wouldn't say they are super-wide in the calf, though, so that may be an issue for some. The zippers took some coaxing but not extremely troublesome on the pairs I received.  Other reviews helped me manage my expectation there, so important.

They aren't exactly dressy, but in the black they are close enough for me to wear in and out of work on rainy days to keep moisture from wicking up my pant legs.  Certainly more stylish than my other rain boots.  The weather is very changeable where I live, especially this time of year, so I expect to get a lot of casual use out of them as well.  I have to attend outdoor casual events for work, and these boots should also do very well for those events.  They feel nice and warm, but the weather has been in the high 20's-low 40's F, so no chance to test in colder weather so far.  They have been great in the rain, it just beads right up on them and my feet and pants have stayed completely dry.  I'm very happy with them.