Maybe there is not such a tradition, but anyway there is a Japanes attitude toward Naked Weddings. Look at:
http://www.asianoffbeat.com/default.asp?Display=896
"Ever consider getting married while you and your spouse are naked, with all your relatives looking on? Some Japanese couples have been opting for the 'Naked Wedding' version with great enthusiasm, according to an unverified source, so take your pick whether you believe this or not.
During the wedding banquet, both the Japanese bride and groom show up before the guests naked. Guests who attend their wedding can choose to wear clothes or to also be naked. A passionate Master of Ceremonies is usually also naked, while the bride and groom's parents and other seniors tend to be more traditional.