What is a group of motorcycle riders wearing similar clothing commonly referred to as?

A group of motorcycle riders wearing similar clothing is commonly referred to as a "club" because this term conveys a sense of organized structure and community among its members. Clubs often have specific rules, activities, and events that members participate in, and the matching clothing often symbolizes their unity and shared identity. The term "club" suggests a formal or semi-formal organization with a focus on camaraderie and shared interests, which is characteristic of many motorcycle riding groups.

While other terms like "gang," "association," and "collective" may relate to groups in different contexts, they do not capture the specific social aspects and traditions associated with motorcycle clubs. "Gang" may imply illegal activities or a more aggressive connotation, "association" suggests a broader, often less personal gathering without the dedicated structure of a club, and "collective" implies a more general or unconventional gathering without the typical motorcycle culture elements. Thus, "club" is the most appropriate term for this context.