Ingrain carpet

a double or two-ply carpet.

See also: Ingrain

References in classic literature ?
The room had, to begin with, a cheerful red ingrain carpet and a set of maple furniture.
Elizabeth, to whom this speech was addressed, did not reply, but moved slowly up the hall by herself, fixing her eyes on the little figure of the English ingrain carpet that covered the floor; while, on the other hand, Richard gave a loud crack with his whip, as the stranger disappeared, and cried:
It also contains details about the weaving of a certain type of carpet in the 18th Century - flat woven of two ply - which became known as the "Kidderminster", Scotch or ingrain carpet.