This short (17 minutes) documentary is included on the White Christmas (1954) DVD. I enjoy re-watching this whenever I re-watch the feature movie most Decembers. Actress Rosemary Clooney shares many interesting reminiscences about the making of the classic holiday film, also about her friendships or working relationships with her co-stars and various others, the stars' costuming, etc. It's a good little documentary.

Here it is as presently posted on YouTube. (for some reason it abruptly ends, there, a couple minutes early)

Please check out the following list of titles and celebrities I've created TMDb threads for: https://www.themoviedb.org/list/118052