Cotton Button-Up Top

I initially ordered this in a medium and it felt too big and boxy, so I ordered it again in the small. The medium runs large, and the small runs small (so it was hard to rate the "fit"). I could wear either but neither really fit like I prefer. The top is really cute and seems very well made. My other two minor issues with it is that the cotton is thicker / heavier than I anticipated - I bought it for summer but it's probably better suited for spring or early fall weather. The other thing I don't love is the length - it's pretty short (especially the one in size small). I like my tops a couple inches longer. Still undecided but, for the price and not really loving it, I doubt I will keep either one.