Thanks for all the thoughts, y'all! A few comments.
JenniNZ and Sisi, I think, in this context, "derivative" is a nicer way of saying "cliché." That pattern with that vest looks a bit like a 1970s costume. (I felt what Lisa was saying and wasn't offended by it.) I thought about trying this with my cognac sandals, but I can't quite imagine weather where I'd want long sleeves and open toes. In our arid climate, open-toe season is limited (which is why I only own one pair of sandals) and my feet are cold before anything else. I do agree that some of these looks would be better with tights, though...I just wasn't motivated enough to put them on for a try-on. Plus, I'm trying to make peace with my knees, and I live in a seasonally-confused place. Except for one month in summer and another in winter, the weather is pretty much all over the place, often in a single day.
fashiontern: The sleeves are less a concern for me (I could make either work) than the length of the Sundance dress. As much as I loved that dress, it isn't super-practical for my life. I could probably make room for both, as I don't have a lot of pattern in my closet right now, and several of my dresses are nearing the end of their life cycle.