A couple of you expressed interest in this knit jacket from JCrew, so here it is. JC actually has several knit blazers to choose from -- a fuller, longer less structured one (which I tried but found overwhelming) and one like this that is cropped (not what I was looking for). Also, one from Factory.

The less structured one comes in navy, black, and tan and is available in petite.
https://www.jcrew.com/p/womens.....name=black

The cropped is only available in XXS and red, right now, but on very deep sale for any tiny women out there: https://www.jcrew.com/p/womens.....or_name=be

Here's the one from JCrew Factory. I have not seen it in person so can't vouch for its quality or fit.

https://factory.jcrew.com/p/wo.....sisearchen

I love the one I kept - heather dusk, one size down. (I probably could wear my regular size too, but it would be slightly roomy.) It is a beautiful knit, has great lines, and is a perfect length. Feels blazer-y but also comfy. I like it with the collar up and down. I'll post some pics of me wearing it this weekend, when I try to assemble some work-travel outfits for next week.