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In page Kimono:

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In the past, a kimono would often be entirely taken apart for washing, and then re-sewn for wearing.[1] This traditional washing method involves two steps: taking the kimono apart and washing each piece (toki arai) and then stretching each piece of a kimono onto a board to dry after they have been washed and starched (arai hari).[2] Because the stitches must be taken out for washing, traditional kimono need to be hand sewn. The process of traditionally washing kimono is very expensive and difficult and is one of the causes of the declining popularity[citation needed] of kimono. Modern fabrics and cleaning methods have been developed that eliminate this need, although the traditional washing of kimono is still practiced, especially for high-end garments.