Make it look like you are holding an object with two hands, when really you are only holding it with one!
One hand is always free, to wave to your audience or to magically produce items.
You can wave a napkin in front of your face for a moment. When you lower it, you’re wearing a wig & funny glasses. Raise it and lower it again, and the disguise is gone. Then raise and lower it and you are wearing a completely different pair of glasses!