The ornamental design for a cloth with rectangularflap, as shown and described.
FIG. 1 is a top plan view of a cloth with rectangular flap showing the flap in a closed position; and,
FIG. 2 is a perspective view of a cloth with rectangular flap showing the cloth hanging on a hook through the flap, the flap being in an open position. The broken lines forming the hook are for illustrative purposes only and form no part of the claimed design.
It is understood that the claimed design consists of the top surface of a cloth with rectangular flap.