Astrid Lindgren
author of the "Pippi Lockstocking" books

• Master Detective Kalle Blomkvist
  Is about a boy, Kalle Blomqvist, who is "hunting gangsters" together with his friends. They all  avidly  gobarefoot and Lindgren explicitly describes the joys of walking barefoot.
  The english language edition is: Bill Bergson and the White Rose Rescue: Freeman, Don [Illus. by].   : NY: Viking Press ; (1965) ; First Edition ; 215 pp. ; Translated from the Swedish by FLORENCE LAMBORN.
  More information on Astrid Lindgren is to be found here.

• Ronia, the Robber's Daughter
  Ronia, who lives with her father and his band of robbers in a castle in the woods, causes trouble when she befriends the son of a rival robber chieftain
  .... "Ronia jumped into her clothes. It did not take long, because all she had to do was to pull a foal- skin tunic over her shirt, with trousers to match. And she always went barefoot, until the snow came, so no time had to be wasted on boots or slippers." (The hardback edition contains line drawings).
  "Ronia spent her time in the woods as usual. It was very quiet there now, but she thought even the autumn woods were good to wander in. The moss was soft and green and damp under her bare feet..."

• The Children of the Noisy Village
  Describes the summer adventures of a group of children in a Swedish village (Bullerby) in a period before the second world war. They spend much of the summer barefoot.