Rebecca F.wrote a review of Patagonia Better Sweater 1/4-Zip Fleece Jacket - Women's on February 13, 2017
Familiarity: I've used it several times
Fit: True to size
As far as mid-layers go, this is the best I've found. It doesn't block wind, but it will shed a light breeze. It is great for layering over a baselayer, but also fits under a jacket.
I am usually an XS in Pategonia outerwear, so I ordered both a Small and XS to try on. The XS fit me through the waist better (although it was a little short) but I could hardly get it on over my arms. I only climb and lift a little, but evidently it's designed for women who don't have arm muscles?
I settled for the Small, which hits me perfectly at the hips but is a little wider/squarer than I would like.