The Kisaragi reference article from the English Wikipedia on 24-Apr-2004
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Kisaragi

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Kisaragi (如月) is another name for February in Japanese.

"Kisaragi" has not such a deep meaning as the other names of the months. You write this as "wearing kimonos over" in *Kanji, but this is not the right meaning of the name of this month. It means "the rehabilitation of plants". February is the second month of the year. In the lunar calendar, it is thought that February is the second month of winter. In the *lunar calendar, January, February, March are winter, and three months from April is spring. Perhaps,people thought that February was the middle of winter and spring.