Dance Style of "Night And Day" from "Gay Divorcee", Fred Astaire and Ginger Rogers

[cuddyclothes]

I don't know choreography, but I can tell a waltz from a jitterbug. For a story, I need a brief description (as in "this is a rhumba) of the Astaire/Rogers dance in "Night And Day" from "The Gay Divorcee", 1934.  I have Googled: "dance style of Night and Day dance" "dance steps of Night and Day dance" "choreography of dance in Night And Day Dance", as well as consulting several books I have about Astaire and Rogers.

If you need me to, I'd be happy to post a YouTube clip.  Thanks!

P.S. There's no tag for "dancing" that I could find.