Also, all of a piece. Of the same kind, as in This legislation is of a piece with the previous bill, or Her rude behavior was all of a piece. The piece in this idiom alludes to a single mass of material. [Early 1600s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.