I've bought two jumper dresses from Phase 8 recently. I'm a size 12, with fairly slender limbs but quite a chunky midriff and they both just work some kind of magic. I think it's the batwing that balances it out somehow. I've had similar in the past with their long knitted tunics.
Forest green
Grey
Sharing for anyone else out there who is always looking for cosy and flattering knitted dresses.