Both are just called "sheets," so it's an easy mix-up. The two do genuinely different jobs on the bed, and once you know what to look for, telling them apart takes seconds.
What a fitted sheet actually is
The fitted sheet is the one that goes directly onto the mattress. It has elastic sewn into the hem, so it wraps around the corners and stays in place underneath you. This is the layer you actually sleep on.
What a flat sheet actually is
A flat sheet is just that, flat. No elastic, no shaping, a plain rectangle of fabric. It sits on top of the fitted sheet, underneath your doona or blanket, and some people use it alone instead of a doona altogether.
The real difference, in short
Fitted goes under you, has elastic, and stays put on the mattress. Flat goes over you, has no elastic, and simply lies loose. That's really the whole distinction, everything else is just personal preference in how you use them.
Do you need both?
Most people use both as part of a set, fitted sheet against the mattress, flat sheet on top, then the doona. Some use the flat sheet on its own instead of a doona altogether, common on warmer nights when a lighter cover is all you need. Others skip the flat sheet entirely and go straight from fitted sheet to doona cover, more a European habit than a climate one. None of these is wrong, it comes down to preference.
What we've noticed, honestly
It-Fits started with just the fitted sheet, that's genuinely all we made at first. It wasn't long before people started asking for a matching flat sheet too, so we added it.
Since then we've heard both sides. A lot of people come back for the full set once they've tried the fitted sheet, because they want that same soft, stay-put feeling across the whole bed. But we've also heard the opposite. One customer, an older woman, told us she was hesitant about the flat sheet because she worried about getting tangled in it, and at her age, a fall from something like that isn't a small thing. Cotton jersey has natural stretch, which is exactly why the fitted sheet grips the mattress so well, but on a flat sheet, with nothing anchoring it, that same stretch can feel clingier than a classic woven flat sheet. Some people love that everywhere, some, understandably, would rather not risk it.
So this really is a preference thing, and we'd rather say that plainly than pretend every piece works the same for everyone.
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