Some manufacturers sell sets made from the very cheapest materials available and others use a finer grade of cotton. This will affect the price of the set and the comforter will be another factor in the price. Some are down comforters and some are just fiber-filled. Always check all of these aspects when purchasing bed in a bag sets so you will get exactly what you want.
Many Americans prefer just the comforter, although a duvet is generally thicker and warmer. With either, you need lots of width and length to cover the mattress and then lots more! Note that the comforter should be a good two feet or more greater in width than the mattress and 8-12 inches longer. A duvet is often shorter and less wide than a comforter, but still larger than the mattress.
Make sure that your designer bedding is rated for your size of bed, or alternatively that its dimensions are sufficient to meet your personal needs. Some people like lots of bedding hanging over the mattress so they can cuddle in and get comfortable. If you are using a flat sheet, then that should be of a size sufficient to tuck under the mattress all round - or be elastically fitted to it.
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