The word 带子 is formed by combining the character 带, which originally meant a belt or sash and conveys the core idea of a long, flat object used for binding or carrying, with the character 子, which functions here as a nominalizing suffix. This suffix 子 adds no independent meaning but transforms the root concept into a common, concrete noun, turning the abstract idea of a "band" into a specific, tangible object like a "ribbon", "tape", or "belt". The construction is a straightforward example of a root morpheme modified by a highly common, meaningless suffix to create a standard, everyday word.