Yukata is one thing (summer fair, fireworks, etc.) but no one said that the fan must necessarily be “wafu” (和風) i.e. “Japanese style”. Although, with Tokyo Disneyland celebrating its 30th birthday this year, I guess we must start thinking of Mickey Mouse as “wafu”; the Japanese already do.
(For a bigger version of this picture both in color and black and white, check my "Japan Arekore" set on Flickr)