Have you ever wondered about the small loop on the back of your button-down shirt? Known as the “locker loop” or “backstay loop,” this feature dates back to the early 20th century when it was used on United States Navy uniforms to keep shirts wrinkle-free in tight quarters.

Over time, the loop transitioned from a practical tool for sailors to a stylish element embraced by Ivy League students, and it remains a common feature on modern button-down shirts. Today, the loop offers both functional benefits for travelers and a unique design element, reflecting its rich history and evolving role in fashion. So, the next time you spot this loop, remember its journey from Navy ships to stylish wardrobes around the world.