You'll need:
A button-down shirt with a collar. The shirt doesn't have to be plain, solid color, but we loved the contrast between the metal studs and the crispness of the white shirt.

Metal studs - You can often find them at trimming stores, or online Make sure you get the kind of studs that have metal spikes on the ends that can be folder over with pliers. 

Needle-nose pliers

Photographed by Shanita Sims