Result: perfect match in size, finally; slightly better felting than the fairy ones; dye colour has stayed more vibrant. Very happy.
4. Stripey slippers
Result: a complete write-off. Should have unravelled them the moment the monumental difference in sizes became all too apparent, but didn't. Vigorous hand-felting and multiple machine washes made little difference apart from to leach the bright orange dye and make them look a funny fleshy pink colour. Will need to chuck out and start fresh this weekend.
5. Giganta-motley slippers
Result: semi-felted; they would probably go a bit more but I don't want to wreck the dye again. The ankles felted better than the feet, resulting in a sort of bag effect. Not bad, but compared with the excellence of the felting on the first pair, floppy.
And here ends the saga of the slippers. The year of the foot continues.