Adult beret yarn and pattern purchased as kit from Virtual Yarns. Kit includes enough yarn (9 colors) to knit 2 baby bonnets and 1 adult beret. Price in US dollars very reasonable and just enough to include shipping.
Capillifolium Baby Bonnet by Alice Starmore was published in Piecework Jan Feb 2009 (cover photo). See that pattern for more info.
Pattern for an earflap hat version (like the baby bonnet but for adults) is now available in kit form from Virtual Yarns.