For knit tops, boxy-fluid or the new sort of A-line sweaters come to mind. Waist-surrendering. Also a good-fitting button-front fabric shirt in a crisp fabric--fitting at the shoulder or just a bit generously in the shoulders so there is enough in the body --still looks sharp over skinnies, I think, if in a modern iteration and not just a "big shirt". A silky-fabric blouse can fit more loosely because of the movement.
Some wrap tops may work if they aren't too empire-ish. Since those are kind of traditional solutions, I you would want to aim for modernized versions with modern accessories.
Hopefully some of our very fashionable apples will chime in with the real advice.
