Kimonos (着物) are traditional Japanese style clothes. "Kimono" meant "something you wear" originally. Long ago, people in Japan wore kimonos every day. Now, people only wear a kimono for special occasions such as formal ceremonies.
A kimono is a robe shaped like a "T". Normal kimonos reaches to the ankles, and have very long sleeves. Kimonos for women usually have a colorful design of flowers, butterflies, etc. Kimonos are typically worn with an obi, the distinctive Japanese sash. Obi are also colorful.