This is the yukata Ivy's wearing in the pictures from Children's Day at the Botanical Garden.
I used the pattern in ISBN 4579108272. The kimono in the book are actually elaborate kimono worn for Shichi Go San, but since all kimono are made from a basic series of rectangles that rely on the wearer's measurement's, it was fairly easy to adapt the pattern
A yukata is a more informal kimono, usually made of cotton and unlined. It's worn during warm weather and you often see them worn during the many festivals that occur during the summer months. I made Ivy's to close with simple sash that tied in a bow in the back. You can see some lovely examples yukata at this Flickr post
Despite being a fairly easy pattern, I made the yukata a little too wide and too short. It actually should be long enough to make a fold that falls just below the waist, you can see the fold in these photos. Also, when I was cutting it out, I cut two left sides initially. And since the front and back is one long piece with no shoulder seam, I had to buy another two yards of fabric. No problem, I though, I'll make a second one and sell it on the shop. And then I cut the second set of sleeves wrong. So the fabric has retired to the closet in disgrace. Maybe I can get a summer top or some pants out of it.