Obs. Also 5 costur(e, costere, coostre, costerde. [a. AF. coster = OF. costier side, also ‘piece of stuff placed on the side (e.g., of an altar),’ f. coste side. A med.(Anglo-)L. costera is found.] A hanging for a bed, the walls of a room, etc. (See also quots. 1844, 1879.)
1385. in Dugdale, Monast. (1846), VI. 1363. Duo costers panni magni de velvetto.
1424–5. E. E. Wills (1882), 56. Þe costers the which hengen in þe newe chamber. Ibid. (1425), 65. A browded bed wiþ þe costures.
c. 1475[?]. Sqr. lowe Degre, 833 (Mätz.). Your costerdes covered with whyte and blewe, And dyapred with lyles newe.
1482. Paston Lett., No. 86, III. 285. I bequeth to Edmund Paston … a fether-bedde … and the costers of worsted that he hath of me.
[1844. Pugin, Gloss. Eccl. Ornament, 81. Coster, a name given to hangings for the sides of an altar or choir.
1879. Simmons, Lay Folk’s Mass-bk., Notes 174. Costers or curtains running on rods at the north and south sides of the altar.]
