Biological composite materials found in nature like nacre, shells of cephalopods, and woodpecker beaks possess superior mechanical properties compared to their simple constituents having weak mechanical properties. The weak suture interfaces present in these biological composite materials play a significant role in achieving excellent mechanical properties since they govern the deformation and fracture mechanisms. These non-adhesive suture interfaces possess non-linear behaviour depending on friction and the geometrical interlocking. Bio-inspired sutured materials are developed by mimicking the excellent properties of biological materials. The geometry of a curved suture can be developed using the two-dimensional (2D) shape descriptor approach. In the present study, an elliptical geometry of the suture interface is proposed, and the analytical equations and finite element results are developed to capture the non-linear pullout response of the suture.