How do you know if your bed sheet is of good quality?

According to many homeowners, buying a bed sheet is not as simple as it seems. Seasoned buyers would tell you to choose your favourite colour and print, but there is much more to it. Sometimes, it so happens that you buy a bed sheet that looks wonderful, but once you are home, it clashes with the rest of your home décor. Sometimes, the bed sheets may not fit your bed properly, especially when you buy online.
So, when buying bed linen, how do you know if the bed sheet that you are buying is of good quality? What do you look for to ensure that your new bed linen is worth your price? Read on to find out.