I recently attended a wedding that required formal attire. Aside from the usual suit I had actually received a box of hankerchiefs (made by Nautica) as a birthday present. Well, I found that somewhat amusing because I didn’t really know how to fold one.
After some research I finally discovered a great tutorial on how to fold a hankerchief by Hazely Lopez of the Hazely Academy of Refinement and Modeling. If you don’t actually know how to fold a hankerchief you might find this useful. I prefer the second approach (the Puff Fold) which is the simplest.