Dear Ms. Preis,
Please abide by the dress code we first mentioned to you at the hospital. In order to avoid conflict, we ask our employees to dress in a manner that is not offensive to other staff members. Because of that, please avoid sports paraphernalia, as that is a sensitive topic in this company. We’ve included a photo you demonstrating such behavior in case our point was unclear.
What may be helpful is following in the footsteps (or rather pawsteps) of night manager Archie Preis. We’ve included a photo that should show how you can support your favorite team/movie/historical figure without offending anyone.
The management (aka mom and dad)