What does "costume" mean?

Costume: Such an arrangement of accessories, as in a picture, statue, poem, or play, as is appropriate to the time, place, or other circumstances represented or described. I began last night to read Walter Scott's Lay of the Last Minstrel . . . .I was extremely delighted with the poetical beauty of some parts . . . .The costume, too, is admirable. Sir J. Mackintosh.