Think about the back of sit-com couches or the couch in your grandma's house. What is almost always folded neatly on the sofa back, or stacked in linen closets and hope chests? A granny square afghan.

To the uninitiated, the pocket square versus handkerchief debate might seem trivial. But in the realm of men’s fashion, these small square fabrics carry considerable weight in determining one’s style ...