It's the Grey Twist Cardi by Judy Brien, and it's awesome. According to Ravelry, she's a new designer, and as far as I'm concerned, a promising addition to the knitwear design world.
The sweater is done in laceweight yarn, and the fabric really reminds me of Versio- super light and airy.
I wish there were more photos, but it looks like a sweet, simple cardigan that would show off fun yarn... I wonder if it'd be nice in a linen lace for summer? The suggested yarn is Madelinetosh lace, which would be cosy enough for fall or spring! So versatile!
I love sweaters that are layerable and simple, with good detailing. I feel like they're much more wearable than the thick and quick aran sweaters I'm generally drawn to... Oh masochism, thy name is knitting.
(Get some free yarn)