The ABU adopts the battle dress uniform hat style for primary use and the floppy hat design is used in some deployed areas.

The U.S. Navy recently debuted its newest uniform, the updated Service Dress Whites (SDW). For the first time since 1980, the SDW's jumper-style uniform ... Uniform page on Military.com.

But over the past century, uniforms for cabin crew members ... Attendants wore the dress with a structured military-style hat, according to The United Airlines Historical Foundation.