Which element is identified as the most critical advancement defining the button's modern identity?

Answer

The perfection of the buttonhole around the 12th or 13th century CE

While the entire evolutionary path contributes to the button's history, the text singles out the perfection of the buttonhole as the most crucial advancement defining the button as we know it today. Without a standardized, durable, and matched opening—the buttonhole—the object remains relegated to the function of a toggle or decoration. It is the successful pairing with this reinforced slit that empowers the button to serve as the primary, defining means of garment closure in modern dress.

Which element is identified as the most critical advancement defining the button's modern identity?
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