Angel Garb Starts With Ski Skivvies

Tonight I'm doing a singing gig as an angel in the Nativity Pageant at my church and I am worried that the drafty church and my gossamer garb will just not hack it in terms of keeping me warm. Much tempted to wear my ski underwear beneath my solemn celestial gown. No one would be the wiser ... except all you folks and I don't figure you'll be there.