scottrc
At least the standard issue uniform for the crew was all white.
From memory, IJN used a mix that was a blend of both RN and USN style uniforms. And worn to similar standards--white in summer months or tropical locations, and blue in winter or northern climes.
I want to remember that Flight Deck Crew had special white uniforms to be more visible while on deck during aircraft operations.
The tail on the white jumper (the bit that hangs off the back of the collar) was medium blue with white piping on the IJN whites. The blues had a matching medium blue with piping. Chief Petty Officers were all white or all blue with matching cap covers.
IJN blue uniforms were more indigo than black, too. The white uniforms will probably render better as a very pale gray. Close up they aer a distinct cream sort of color, but, that's with 70+ years of aging, too.