Untrouser

You magically sever the link fastening trouser to waist, making the target's pants fall to the floor. A targeted creature must make a Dexterity saving throw and, on a failure, have its pants fall to its ankles. A creature that is not wearing pants succeeds automatically on this save. A creature with its pants to the floor has its speed halved and has disadvantage on Dexterity saving throws. A creature can use its action to pull its pants back up, ending the effect.

At higher levels. When you cast this spell using a spell slot of 2nd level or higher, you can affect one additional creature for each slot level above 1st.