A character wearing a different uniform than their regular uniform from within the same franchise, such as a school uniform or military uniform.

For example, in post #10930144 (as seen below) Saten Ruiko is wearing Tokiwadai Middle School's Tokiwadai school uniform, despite being enrolled in Sakugawa Middle School and usually wearing the Sakugawa school uniform. Importantly, both schools and both uniforms are from the same franchise, Toaru Majutsu No Index.

Examples

As above

Dante wearing the standard LCB uniform rather than their custom LCB uniform

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