Definition of "trangam"

Hey day! vvhat's here? vvhat a Devil's the meaning of all theſe Trangams and Gimcracks, Gentlemen?

1712, Humphry Polesworth [pseudonym; John Arbuthnot], “Of Some Quarrels that Happen’d after Peg was Taken into the Family”, in John Bull Still in His Senses: Being the Third Part of Law is a Bottomless-Pit. […], London: […] John Morphew, […], page 24

And meet time it was, when yon usher, vinegar-faced rogue that he is, began to inquire what popish trangam you were wearing […]

1820, [Walter Scott], The Abbot. […], volumes (please specify |volume=I to III), Edinburgh: […] [James Ballantyne & Co.] for Longman, Hurst, Rees, Orme, and Brown, […]; and for Archibald Constable and Company, and John Ballantyne, […]