Fix duvet / duvet cover
For example, there is the large furniture store with I year-round duvets. These ceilings consist of two separate ceilings. In the summer one sleeps under one and in winter one puts both blankets on top of each other and sleeps under both. Unfortunately, both blankets do not really hold one over the other and cause a "bedlam chaos". Now the tip: There are self-adhesive Velcro. Just fix both blankets around each other with around 12 Velcro pieces and it's all good :-) Works great to close the kind of bedding, which is almost open on one side.