Fabric structure and its thickness influence the heat and moisture transfer and hence thermal comfort. This is because fabric structure and thickness affect the air and moisture permeability, which play a significant role in heat and moisture transfer. so we can say that fabric structure plays an important role here. Fabric structure and design is an important part of fabric engineering. This course is designed to make the learners to become capable of comprehending the basic structures of woven and knitted fabrics , further they will be able to plan or design innovative structure.