Star Trek Uniforms
You know the division before you know the character. In The Original Series gold is command, blue is sciences and medical, and red is operations, engineering and security, which is how a joke about mortality rates entered the language.
The Original Series uniforms were cut from velour, which shrank every time it was cleaned and had to be replaced continually through the run. The colour logic was not fixed either: by The Next Generation command and operations had swapped, putting Picard in red and Worf in gold. Same grammar, different vocabulary.
Wearing one of these is not quite fandom. It is enlistment.
Officially licensed Star Trek Uniforms t-shirts printed on heavyweight cotton, with womens tees, long sleeves, hoodies, tank tops and youth sizes across the range.