Haberget (halberget, hauberget, halberject) was a kind of cloth described in the Magna Carta, whose precise nature is not altogether certain; the New Oxford English Dictionary defined it only as "a kind of cloth". A 1968 review by the Society for Medieval Archaeology of the UK proposed that it was a woolen cloth known for a broken diamond texture that was required by early looms.
As one of three kinds of cloth named in the Magna Carta and in a variety of other medieval sources, it is believed to have been a major article of commerce in the 12th and 13th centuries. The cloth could be dyed green, 'peacock', dark brown, or in grain, and was available in coarse, good, or fine qualities, selling from 5.5d. to 4s. a yard. As such it could compete with griseng for use by the poor, or might be of a grade suitable for royalty.
The texture of the cloth is believed to have superficially resembled a hauberk (chain mail) due to the pattern of horizontal rows, known as a 'broken diamond' or 'broken lozenge' twill, which has been excavated from peat bogs dating back to the 4th century A.D. Made of worsted yarn, the pattern is not obliterated by heavy pounding. In Iceland, Norway, and Sweden such cloth is referred to as hringofann, meaning "hauberk", a term persisting to the present day.