I must admit I wear black most days for work. As I have really terrible legs I almost always wear trousers/slacks to work, and they are always black or dark grey. There are plenty of other women where I work who wear black too. I don't often wear black tops though, and when I do, I make sure that my trousers/jeans aren't black on those occasions.
I'm usually doing something that gets me dirty, be it at home or at work, so black or grey is generally the colour of choice for me.
I will say, clothing colours are very important to me, and if I want to lift my mood I'll wear something bright, even if I team it with black.
I'll try to avoid pale pastel or beige tones though, as I feel they make me look old.