What material was used to construct the earliest known buttons for clothing?

The earliest known buttons were discovered in the Mohenjo-daro region from the Indus Valley Civilization, now known as modern-day Pakistan. The buttons, which date back to 2000 BC, were used for decorative purposes and constructed from curved seashells.

Asked by Rachel Bortles · Last updated 5 years ago · 4.4K views · SOURCE