Definition of "simar"

[T]heir beautiful tresses were braided and incensed; and they were wrapped in symars whiter than alabaster.

1786, [William Beckford], translated by [Samuel Henley], An Arabian Tale, from an Unpublished Manuscript: […] [Vathek], new edition, London: […] W. Clarke, […], published 1809

[T]he profusion of her sable tresses, which, each arranged in its own spiral of twisted curls, fell down upon as much of a snow-white neck and bosom as a simarre of the richest Persian silk, […]

1819 December 20 (indicated as 1820), Walter Scott, chapter VIII, in Ivanhoe; a Romance. […], volume I, Edinburgh: […] Archibald Constable and Co.; London: Hurst, Robinson, and Co. […], pages 146–147