The word "kimono" in Japanese simply means something to wear. It's made of silk and is usually very expensive. Nowadays it's worn at formal or traditional occasions such as funerals, weddings or tea ceremonies. Putting on a kimono takes some practice. Tying the belt (obi) alone is especially difficult so many people require assistance in doing it.
Wearing a kimono properly includes proper hair style, traditional shoes, socks, underwear, and a small handbag for women. A Japanese woman usually owns only one kimono, typically a furosode kimono, which is worn for the coming of age ceremony on her 19th birthday.