@Gerry Nelson, is that a double four in hand?
Yes, I wanted the knot to have a little more substance.
What do your clients expect you to wear, the standard navy/charcoal? I'd say it's always better to err on the safe side, but you might be able to pull off a brighter blue during the warmer months. Perhaps you should look into airforce blue? It's a little different from navy, but not so much that you'll raise eyebrows. Might be hard to find OTR though.