The word kimono 着物 simply means ‘thing(s) to wear’ and is pronounced kee-mo-no. The plural of kimono is simply kimono. The kimono has had a long history in Japan and the kimono has changed over time to reflect the society and culture of that period.
With kimono Haori and Hakama are often worn.
For more information about kimono see this website: http://www.japanesekimono.com/