I'm famous for not having the Christmas spirit, at least as the world conceives it. But today was an exception. After Mass I was to offer the traditional blessing of throats associated with St. Blaise. In thinking ahead about how I wanted to do this, I thought that after the final blessing I would put aside the green chasuble and stole and put on the red stole appropriate for Blaise, bishop and martyr.
Only after doing this did I realize that I ended up wearing a red stole with the festive green cincture I use for Sundays in Ordinary Time. So I felt very Christmas-y for once.
For the rubrical reference made in the title see the praenotanda of the De benedictionibus (Book of Blessings) number 37.