Years ago, we obtained several eiderdown comforters, full double-bed size. They were expensive, but I think they are out of sight now.

A lot depends on whether one lowers the temperature at night- eco-nuts- or maintains a livable temperature; 24/24.

Silk? Dunno. We suckered on silk nightwear a while back. It has been relegated to sally Ann. Tended to crawl and felt slimy.