https://workplace.stackexchange.com/questions/162595/what-is-generally-meant-by-no-tennis-shoes-in-a-dress-code

I believe there's a useful question in here. While we can't say what "No Tennis Shoes" definitively means for a specific company, it is a phrase with general cultural meaning and connotations that can be usefully talked about, such as in this question:

https://workplace.stackexchange.com/q/1291/31777

So I've edited the question slightly to make it a general one rather than company-specific and I submit that it should now be reopened.