Today there's a clear distinction between the robes worn inside the house, as bath robes or as pajamas. Called nemaki, they are usually white with small geometric or floral model prints (the most popular print color is indigo), with simple, narrow sleeves and are worn with a narrow belt - that's the kind of robe usually provided by Japanese hotels.
The exterior robe, yukata, are often vividly colored with floral motifs for women and dark colored with geometric patterns for men, have wide sleeves and are worn with a wide belt (obi).
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 11mm
Aperture: F/5.6
Shutter Speed: 1/40s
ISO Sensitivity: ISO 640