If you were dreaming of undressing, it can mean you are getting rid of an old external appearance. The old need for that look has passed and its time to undress from that look.
A dream about undressing can e a symbol of change – change that is coming in your real life.
You have to reflect on your life and think about how best the dream speaks to you.
If you had been assuming a special dressing (personality), then this dream tells you its time to undress yourself from that falsehood.