Cheaper than a tuxedo, probably.

Well, maybe getting married on the bridge of the Starship Enterprise isn't the silliest thing to do, after all. A couple in Akron got married on Christmas Eve, dressed as Mr. and Mrs. Santa Claus. And all of the guests had to wear Santa hats. Why would they recite their vows dressed in Santa costumes? Because "the idea just seemed like a good way to express their faith as Christians."