FACT
Buttons and button-like objects used as ornaments or seals rather than fasteners have been discovered in the Indus Valley Civilization during its Kot Yaman phase (circa 2800–2600 BCE)[5] as well as Bronze Age sites in China (circa 2000–1500 BCE), and Ancient Rome.
Buttons made from seashell were used in the Indus Valley Civilization for ornamental purposes by 2000 BCE.[6] Some buttons were carved into geometric shapes and had holes pierced into them so that they could be attached to clothing with
thread.[6] Ian McNeil (1990) holds that: "The button, in fact, was originally used more as an ornament than as a fastening, the earliest known being found at Mohenjo-daro in the Indus Valley. It is made of a curved shell and about 5000 years old."[7]
The earliest functional buttons were found in the tombs of conquering Hungarian tribes from the late 9th century.[8] Functional buttons with buttonholes for fastening or closing clothes appeared first in Germany in the 13th century.[9] They soon became widespread with the rise of snug-fitting garments in 13th- and 14th-century Europe.
Source:
Button - Wikipedia, the free encyclopedia