The first shirt that says it is black/navy - I do not think it means what you think it means.
From the vendor:
Sometimes we name them based on the pattern or stripe and it’s very light black stripes mixed with the blue.
very light black stripes?
So light grey?
And maybe mixed with periwinkle.
This a white/gold blue/black kinda sit-e-a-shun we gots 'ere