How to keep a duvet from moving around inside a duvet cover?

[BillGates]

Originally posted by: ICRS
Most people I know refer to the inside as being the comforter, and the cover as being the duvet. That is how most if not all retailers in the U.S sell it as.

 

[yours truly]

2 single duvets maybe? probably look a bit odd though

as a side note, i hate silk/satin bedsheets