I wore a long and simple maxi dress from H&M on sale for 15 dollars, with a cute cropped sweater I bought in Korea for ten bucks! (lookatju.com)
I made a couple of simple maxi dresses a couple of years ago, similar but no sleeve shaping at all, I think I will try taking just a bit from the sides to make a bit of a sleeve as you have here, I love the way this hangs. (rivaladiva.com)