In this paper a new scientific method is developed to measure volumetric density of any three-dimensional limp structure such as fabrics whatever their type (woven, non-woven, knitted, etc.), paper, and so on. Material needed for testing must have a perfect rectangular strip shape. There is no need to know how long the tested sample is. There is also no need to measure how wide the tested sample is as width is adjusted using a template. The necessary condition is that these structures are very easy to bend. This method depends on mathematical relations and physical interpretations after shaping (corrugating) a fabric strip round light circular straight identical Cylinders placed in one plane in a jamming situation Fabric shaping is repeated on another part of fabric strip but with another cylinder diameter. This results in a new corrugated fabric weight A formula is derived to obtain fabric volumetric density as a function of fabric strip width, number of cylinders used in every corrugating process, two weights of corrugated fabric and two cylinder diameters. Cylinder diameter must be proportional to both fabric thickness and fabric flexural rigidity. This means that, to make bending and therefore corrugating easier, cylinder diameter must be properly chosen The idea of a new fabric volumetric density meter called HFDM is explained.