Aria is knit from the top down in one piece with raglan shaping and rib trims. Using Sparrow at a looser gauge provides a lovely drape and a fabric that is perfect for summer evenings. An offset buttonband with large buttons adds a bit of whimsey to the traditional cardigan shape.
And if you feel like a bit more asymmetry (last photo), button the top button normally. Then fold the next two buttonholes together and button them both with the second button, then do that again for the third button. When I get the sweater back, I will but up a better photo of it this way