I don't make who I am a secret but I also don't go out of my way to let people know. When they ask provided it is done in a respectful manner I will spend the time to answer them.
One of the problem questions is "why" to this I usually answer because it is who I am. Then I ask them why they like a certain physical type. I have yet to meet anyone that can answer that logically, but they all can tell me what it is that gets their mmmm attention.
As for your working you can wear a collar that isn't obvious, such as a anklet, bracelet, or just a specially purchased for this necklace that the 2 of you know is your work collar.
I normally have collars for all occassions so that she has her Master with her all ways.