Comment on What is this specific kind of sheet called?
dandelion@lemmy.blahaj.zone 5 days ago
I mean, it might have just been a liner for a comforter - there are essentially sheets that are sewn together that you can fit a comforter in, so you can take the comforter out and wash the sheets occasionally and keep the comforter clean.
So maybe google “duvet cover” or “quilt cover” and see if that matches?