If your costume for the school play includes wearing pince-nez, never fear: all you need is a small pair of spectacles that clip on your nose.
The most fun about this word, from French for "pinch nose," is pronouncing it in a highly affected way. It denotes a pair of eyeglasses without earpieces that get their grip by spring action on the schnozzle. You're most likely to come across someone wearing pince-nez in an old novel, since they were at the height of their popularity in the nineteenth century.