Ashley's Pants Enlarger

Who's that girl next door living in that Haunted Mansion. Well she created this spell. You target 3 creatures that are wearing pants and shout "Pantalones Giganticus". Each of them must make a Charisma saving throw or have their pants enlarged. While the the targets pants are enlarged, they have disadvantage on Dexterity saving throws against spells or other effects and on acrobatics checks. The targets movement speed is also reduced by half. If the target attempts to dash on their turn, they must make a Dexterity saving throw or fall prone. This Dex save does not have the disadvantage of this spell

If the pants targeted are part of armor, then the target has a -2 to their armor class.

A creature can attempt to escape their pants using their bonus action and making a Dexterity saving throw without disadvantage. If this Dexterity saving throw fails, then they fall prone. They can also make a Charisma save at the end of their turn to shake off the spells effects.

At Higher Levels When cast at 4th level or higher, you can target 1 additional creature wearing pants. In addition, falling prone due to this spell also now does damage. This does 1d6 bludgeoning damage per additional level and is considered magical for the purposes of overcoming resistances or immunities.