of a piece

From an obsolete sense of a (“the same”).

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of a piece

1. (idiomatic) Of the same kind.
   • 1894, James George Frazer, The Golden Bough‎^[1]:

     Strange as this expectation appears to us, it is quite of a piece with early modes of thought.

2. Used other than figuratively or idiomatically: see of,‎ a,‎ piece.

• (of the same kind): of a blood, of a feather, of a kind

• of a piece with

• all one
• monolithic