Everyone's bedding preferences are different, but at the very least you'll need a fitted sheet, pillowcases, and a cover of some sort. In Europe, it's more common to forego a flat sheet and use a removable, washable duvet cover instead. This is becoming a popular approach in the U.S. as well, which is reflected in the retailers on our list that offer sheet sets without a top sheet. A more traditional American sheet set will include a fitted sheet, top sheet, and one or two (depending on bed size) pillowcases. If you prefer to sleep with more pillows, be sure to order extra pillowcases or matching shams. When it comes to choosing a cover, it mostly comes down to your temperature preference. A heavy-duty duvet insert in down or down alternative is the warmest option and can be made even warmer with extra blankets. A coverlet or quilt is a good option for hot sleepers, as is a lightweight duvet with a breathable cover made of linen or percale cotton.