Let it Snow, Let it Snow, Let it Snow was written by lyricist Sammy Cahn and composer Jule Styne in 1945. The song was written in July 1945 in Hollywood, California during one of the hottest days on record. It is one of a number of winter-related songs generally associated with the Christmas season, despite there being no direct reference to Christmas in the song.
Outfits Isabella wears during the song:
Her regular winter outfit.
Same outfit, with purple santa hat.
Same as above, with white coat with bow at neck.
Light purple hoodied coat with her hair tucked in, with light purple muff.
Fuzzy dark purple hoodied coat, with indigo leggings and dark purple boots.
Her regular winter outfit, with scarf and mittens added.
White coat with dark purple pants, boots, and hat with dalmation design (end credits).
White coat with purple miniskirt, ice skates, and her regular winter hat but darker (end credits).
Isabella makes 8 clothing changes in the song.
Given the romantic nature, this song has to do with Isabella's affections for Phineas Flynn, as seen in "A Phineas and Ferb Family Christmas".