I used to cover up at work, I worked for a VERY conservative church as an office manager, I had to interact with food pantry/ clothing closet clients on a daily basis. We were told to dress nicely but not "superior". So things like jeans with no holes and a polo shirt were ok. No visible tattoos or piercings.
Well the ac died in the building and it was 105 outside, so I wore a skirt and a nice shirt forgetting about the policy. I have my calf done as well as my foot. I showed up to work that day and so did the board. After seeing that my tattoos were not offensive, and they were actually a good talking point between myself and some of our regulars, they amended the policy.
I realize this is the exception, I never in a million years would have thought they would amend the policy, in fact I was preparing to be fired.
Now I work in a bakery, but don't deal with clients anymore, you can see my newly acquired back piece through my chef coat, but no one seems to care.