Far from me to argue with such an illustrious person as you, Pusser ... but:
My naval uniforms are from a time when Logistiks was not even a gleam in your dad's eyes. They are the original brand new issue of naval DEU from the Mulroney government's decision implementation time. So don't blame things on logistiks.
And yes, pre-unification uniforms were (royal) navy blue, and after three washes, all of a different colour, which is why, when the uniforms were re-introduced in the 1980's, a decisions made to go to all black, even though we call them navy blue, because it retains its exact hue without differential fading and each batch can be consistent - something near impossible even today with navy blue dyes.
Don't let pictures, taken on black and white film fool you as to what hue of blue existed at the time, and if you have actual colour pics from those pre-unification days of a whole platoon of sailors, then you will notice right away the incredible different colours of their navy blue dress.
In this, we are not alone: The US Navy, the Japanese Maritime self-defence force and the Russian navy all use black, for the very reasons I gave above.