illustrated by Yaroslava
When the little boy realizes he's lost his mitten (which at this point has been broken apart by all the animals) he sees a little mouse "scurrying away with a bit of red wool perched on her head. It looked very much like the lining from the thumb of his missing mitten." But no matter, for when he gets home his grandmother has knitted him a brand new pair.
adapted and illustrated by Jan Brett 1989
It's a cute Ukrainian folktale and both versions are terrific. I think I'm partial to Yarolsava's bright graphic illustrations though.