"Old-timey"?!? Those 3D glasses were the shiz when I was a kid! You basically couldn't go into a store that didn't sell flimsy cardboard 3D glasses... then you'd take them home to see the cool messages that were in ~3D~ on your cereal box.

Don't remind me how old I am.

Those glasses were the first thing I thought of, naturally, but yeah, I figured it was so she could see in the dark/protect her from Sunny's spells in case of friendly fire, and have the added bonus of looking cool. :P