It’s a uniform, not a personal fashion statement. At this point in time pants and suits are gender neutral.
One uniform, one standard. Can’t meet either you shouldn’t be doing the job.
Have you read the dress instructions? It's certainly supposed to make a statement:
1. A military force’s uniform is an outward symbol of its commitment, identity and ethos. Coupled with overall appearance, the uniform is the most powerful visual expression of pride by the individual service member, and is the primary means by which the public image of the CAF is fashioned. <--that's an intentional word there.
4. ...As items and orders shall be designed for wear by the total CAF population, differences in body morphology shall be given appropriate consideration in detailed design and tailoring.
In history, uniforms have been absolutely about fashion. The dress uniforms have been about conveying status, power, authority, rank, and any other number of identities beyond those "issued" by the military. They have often considered the fashion of the day, which is why some uniforms had tight pants and others had baggier ones; it's why some jackets are double-breasted, others single, others buttoned, others toggled. Clothing is entirely about fashion.
The key thing about the "one uniform, one standard" argument is that it is based on a presumption of all things being equal, which is only possible in the homogenised straight, white, man's military (and that's not even that homogenous given how different men's bodies can be in height, weight, and musculature). The idea behind "one uniform, one standard" is the same idea behind meritocracy (that things should be based on merit is problematic because it assumes only the credentials of exactly alike people and ignores the strengths and merits brought by diversity of thought, experience, and perspective especially of those from the margins), and it's based on the idea that the standard is and should be the one determined by a select few. That select few are not the majority, they are not neutral.
Also, "one uniform" smacks of unification talk, a thing that
so rankled some senior officers that they resigned over the uniforms being the same across the elements! See "Unification" at the link. That was back when no one thought about women's bodies much let alone anyone not identifying as either man or woman. So, no. There should not be one uniform.