This study aims to establish a comprehensive methodology for determining the microstructural properties of hybrid yarns used in composite materials. By developing accurate models of hybrid yarns and composites based on detailed microstructural information such as fibre orientation, fibre diameter and distribution, this approach lays the foundation for future advances. These models, enriched with accurate microstructural data, will facilitate the creation of new modelling techniques that can be used in future research to explore the correlation between microstructural properties and mechanical performance of composite materials.