Dark Sapphire goes well with black, doesn't it?
The question of what color the cap should be was the most difficult. Just because we are here in Hamburg, we can't go for blue again, and besides, blue often doesn't go with black. But with as much black as we wear, it has to go with it somehow.
When we were looking through the clothes rails, the color “dark sapphire” caught our eye and it was clear - it was going to be blue after all!!
Conclusion: such a dark blue definitely goes with black.