Collar of SS

B. will find a great deal about these collars in some interesting papers in the Gentleman's Magazine for 1842, vols. xvii. and xviii., conmunicated by Mr. J.G. Nicholls; and in the Second Series of the Retrospective Review, vol. i. p. 302., and vol. ii. pp. 156. 514. 518. Allow me to add a Query: Who are the persons now privileged to wear these collars? and under what circumstances, and at what dates, was such privilege reduced to its present limitation?