Thank you, Ladies, for all your replies. This topic has sparked a lot of debate around here with no clear winner (although I think Yes has a slight lead) and we are keeping an eye on all the clever responses :lolots: I personally am leaning toward the idea that if you are wearing all black (including shoes), to throw a navy bag in the mix may look like you didn't have a black bag so you used your navy one. But then again, if it is a PATENT navy bag, well then that complicates everything and I think that would definitely be a Yes. Ohhh, but what about a really gorgeous navy glazed lamb...hmmm. Now I am on the fence too. 
