Believe it or not, getting a good, consistent navy leather is more difficult than one might think. Many (probably most) of us use crust leather to achieve a blue/navy leather as many tanneries don’t offer one pre-dyed and if they do, won’t really be the exact shade you might be looking for. Horween’s navy cordovan, as seen here on Carmina’s models, is probably the nicest shade that I have seen in the leather industry (for a solid color). It’s navy color is always so deep and just the right shade in order to not quite be black, but also not be too light either and thus deter people from purchasing it.
As it is so dark, I really don’t see why they could not be used in even the most professional environments. If one can wear brown or even burgundy shoes, then a navy such as this should be even more appropriate, as it is far less noticeable (in contrast) to those lighter shades. Yet why don’t we see it more? The answer is simple really: social conditioning. But in order to break this mental prison we put on ourselves more people have to go bold and wear them and break these silly ideas that blue can’t be worn professionally. Because in reality, it can and that is the plain truth! GO NAVY!