Composite materials offer a unique advantage in structural applications as their design is inherently linked to fibre orientation, matrix composition, and geometric configuration. Unlike conventional materials, composites allow specific adjustment of mechanical properties, including strength, stiffness, and weight, through the design of layering and fibre alignment. This paper investigates the influence of fibre combinations and layer variations on the tensile and transverse modulus of composite materials using theoretical analysis. Here, Kevlar 49, Epoxy LY556 composites with different layers are considered to provide valuable insights into optimizing composite configurations to achieve superior mechanical properties for advanced engineering applications. The findings indicate that the careful consideration of volume fraction, fibre orientation, and stacking sequence is essential in designing composite fibres with the desired mechanical properties of specific applications. However, the extent of improvement depends on the interaction between fibres and the matrix and the structural design considerations. This research contributes to the development of high-performance composite materials, offering a foundation for improved structural efficiency in structural engineering sectors.