Where "hilarity" for the heroine generally involves her losing her job for being assumed to be morally deficient. Also loss of boyfriend/fiancé. Loss of housing imminent. Hero's wealthy and awful fiancé rages flamboyantly, with compulsory furniture-chewing, histrionics, and vengeance.

I'm sure Husband could supply you with a suitably niche list. You weren't far off with "new hat". "Poor but feisty young lady acquires stylish hat/fur coat/diamond necklace via good deed to disguised rich man; both parties suspected of having an affair. Hilarity ensues. They fall in love and marry."