A dressing gown and a kimono are not the same thing. However, over the course of history, the dressing gown has been inspired by the traditional patterns and cuts of kimonos.
The Japanese kimono is a garment that comes in many different designs. A classic kimono has a narrow collar and is worn around the waist, and they are used today mainly by Japanese women on ceremonial and traditional occasions.
A yukata is an informal variant of kimono that can be used during the summer, or as a dressing gown. Both traditional kimonos and yukata lack pockets, but have wide sleeve openings with a fabric fold that can be used as a pocket.