This paper describes a model for simulating the flow of air through multiple layers of air permeable clothing. The model divides the clothed body into angular elements and tracks the air flow through each element. This approach allows for some complexity in the geometry of the clothing worn over the body and in clothing structures such as seams. We give an example of how this air flow model can be used to characterize the hazard from an aerosolized threat to the wearer of an air permeable protective garment.