Carla Z.wrote a review of Patagonia Nano Puff Insulated Jacket - Women's on November 27, 2017
Familiarity: I've put it through the wringer
Fit: True to size
I mainly got this jacket to travel with, its baggy enough to layer with and thin enough to wear under a larger/warmer jacket. This is the perfect laying tool. I wore this mostly in 40-50 degree weather with a long sleeve or merino wool sweater under and was felt very comfortable. This is of course vary from person to person but thats the ideal weather for this jacket, i think. Temps did drop to mid 30s at night and I all did was add a warmer sweater under a scarf and I was good to go. This jacket does give you good enough wind protection but its not 100% windproof.
My only compliant about his jacket is that some of the stitching started to come off, for the price I paid, I expect a good quality jacket, the stitching issue did become a little annoying. Specially, since I have only worn it for 8 days straight, day and night.
Aside from that, I love this jacket. Its extremely thing and light weight, with that in mind don't expect a winter jacket, best used for layering.
If you want something slim fitting go down a size or go with the patagonia down shirt.