While it may seem that a two-ply bed sheet would be a better choice with the greater number of fibers it contains, this isn’t usually the case. Two-ply sheets are often rougher and less durable, as cheaper materials are typically used. Focus more of your efforts on finding the right material and weave, but do try to stick with one-ply sheets. 

In 1689, English diplomat, Paul Rycaut visited Hamburg in Germany where he first experienced sleeping under a duvet. He sent his friends back in England some bags of eiderdown with instructions on how to make their own duvets and he also tried to sell the duvets himself. Unfortunately for him, the British people were not keen to embrace this new concept. It was prohibitively expensive, so instead, they opted to carry on using the more affordable sheets and blankets.