Review on Squares Accessories: Tuxedo Jackets & Assorted Men's Accessories - Ties, Cummerbunds, and Pocket Squares by John Camelio

You weave the bottom of the pocket square in/out of the 3 holes and then the fabric is held in place. If you compare this pocket square to a spring, the spring-loaded pocket square holder will hold the fabric better. However, spring-loaded models are often a bit short, so that they can fall so far into your trouser pocket that you can no longer see the handkerchief. This pocket square holder is slightly higher, so it stays in place. so deep in the pocket that the handkerchief disappears.