Superhydrophobicity is often described in terms of water contact angles higher than 150° along with lower roll-off angles. Surface roughness is one of the main parameters responsible for inducing superhydrophobicity on any material. One such intriguing material is superhydrophobic electrospun nonwoven mat but the design parameters for creating surface roughness are unclear primarily due to its irregular surface. Here, this irregular nature of superhydrophobic electrospun mat is probed through a simple analytical model based on the first principles of stereology revealing the important design parameters as porosity and fibre orientation distribution. Theoretically, we have shown that simply enhancing the porosity of an electrospun mat having intrinsic hydrophilic fibres, can still demonstrate the superhydrophobic behaviour.