Actually, taiko-musubi was a variation of a knot used by men, but it became so successful that today it is one of the most popular obi knots, being worn on both kimono and yukata, by women of all ages.
EXIF info:
Nikon D80
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 45mm
Aperture: F/5.6
Shutter Speed: 1/320s
ISO Sensitivity: ISO 100