These are the wardrobe files of the English Opera Group/English Music Theatre Company, for Britten and non-Britten operas.
The files include wardrobe plots, wardrobe inventories, prop lists, cast lists, rehearsal and performance schedules, costume designs, fabric samples, measurement charts, make-up charts and correspondence.
A wardrobe plot is an actor-by-actor, scene-by-scene inventory of all the costumes in a production, with a breakdown into every separate item in each costume.
48 files
See Britten-Pears Foundation art catalogue for set and costume designs held in the art collections. These include designs by Peter Snow for Beggar's Opera, John Lewis for The Little Sweep, Ceri Richards for Noye's Fludde, and Charles Knode for Death in Venice and Owen Wingrave.
Archive
https://www.bpacatalogue.org/archive/EOG-11