another use for a drop cloth shade added to a pergola. on the top back of the chair\u2026i decided to keep the original seams and \u201cboxed\u201d the top edge i played with it and decided it looked better to keep the . waterproof pet couch covers. white couch slipcovers. how to sew a chair cushion or bench slipcover way easier than you think!. canvas drop cloth from lowe\u0027s blue hawk. img_8280.