Piece of fabric (probably nylon) with lacy design. May be of use as net curtain for small window (but it is thicker than most net curtains usually are). Or possibly for someone making nylon lingerie or costumes for theatre/fancy dress.
It is NOT a complete rectangle. At its longest it is 200cm, at its widest 160cm. It is clean, and apart from a couple of small holes near one of the edges (probably made by scissors), it is in very good condition.
First picture shows a close up of the lacy design. Second picture is a diagram of its approximate shape and dimensions. Third picture shows the whole piece of fabric, but only in a general way. Collection is from the Langsett Road side of Walkley. Evening collection best with me