The outfits are off-duty, and hence can only be used by the captain. The description is wrong and I apologize for that.
However, it may be possible to change it so bridge officers can use off-duty and other costume types. If there is a strong desire for this I will see what I can do about that.
I suggest that, instead of having designated slots, that a drop-down menu to choose between Uniforms and Off-Duty Outfits be added to the costume screen. Not sure how technically feasible it would be, but it would give players more flexibility without fear of players combining Uniform and Off-Duty elements (to remain truer to uniform IP if that's the concern).