Do you like wearing a warm scarf around your neck in the wintertime? Which is the correct plural of scarf—scarfs or scarves?
The correct way to spell the plural of scarf is scarfs or scarves. Though the plurals are interchangeable, there is a difference in pronunciation. You can hear the F and the S at the end of scarfs, but scarves ends with a V sound and the final S sounds like a Z. Scarves is more popular than scarfs. Does it sound more correct to you? It could be because of other nouns that end in an F sound when singular and -ves when plural. For example, thief becomes thieves and knife becomes knives. Let’s look at some examples of scarves and its alternative plural scarfs in a sentence.
from Grammarly Blog https://www.grammarly.com/blog/scarfs-scarves/