I have a lovely new duvet. It's great. However it absolutely will not stay in the duvet cover properly but steadily creeps into a ball over the course of a few days. Different duvets in these sheets are fine. This duvet however won't work with any duvet cover - it refuses. I dont want to get rid of the duvet because it was expensive, I really like the weight and the comfort of it when it isn't pissing off to the far corner of the cover.
Please give me some ideas to avoid me slipping into madness. Google hasn't offered much.