Japan has four seasons and the fashion follows that periodical cycle. In winter, the fabric used for kimono is more heavy weighted like wool. Sometimes, additional items like haori, hand muffler or even boots are considered stylish in winter. Check the picture below. I love the checkered juban. They looked outstanding.
Source: http://www.tokyofaces.com/2011/12/15/kimono-works-in-the-winter-too/