NWT Nasty Gal boxy Jumper Dress

Actual Medium BUT as all the reviews online warned, this dress runs really big so check the measurements. I love the sack-fit of it though. It hangs straight and boxy with more room in the sides than the picture shows. I assume the model is wearing an xxs though, judging by how it fits her. Real cute piece though. Just been hanging in my closet waiting to be worn. Size Medium but 20" across laying flat so calling it an XL for listing purposes.