Pants or leggings being worn under a skirt is not a trope on its own. Here's a list of tropes that "Skirt over Slacks" might refer to:

* MeaningfulAppearance: The pants and dress a character wears tells us something about their personality or background.
* ModestyShorts: A character wears some form of leg wear under their skirt or dress for modesty reasons.
* TomboyWithAGirlyStreak: A tomboyish character wears a dress or skirt over her pants to highlight her femininity.

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