One can attribute the true nature of the jacket's use to wanting to cover up Cammy's original design as a means to "hide her dignity", but in doing so it becomes functionally useless. It does nothing to imply anything to her character, nor does it lend anything to her style of fighting; meaning it restricts her upper body movements, completely. In comparison to the original designs, this makes even less sense due to the fact that Cammy's breasts and midsection are completely covered, so this is just silly conservatism at play instead of actual design. Sadly, this makes the design generic, and bland, and much like Taki, this character seems like she'd be an extra in a superhero group shot (The Masked Militarian!!)