Should adults be wearing college football jerseys, etc., to work?

I have a colleague who is a huge SF Giants fan (baseball). Occasionally, when the Giants play at home, he may wear a Giants jersey (especially, if he plans to attend the game). Actually, during playoffs, a big portion of SF may be wearing something orange to support the team (say, socks) :-).

Unless you interact with customers, in the Bay Area, nobody cares what you wear. Shorts and sandals are not uncommon among software engineers.

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Depending upon the public view of the employee, if it is done on Casual Friday, then fine.

However, I have never worked at a place nor been a consultant to a company that would allow their professional staff wear things like that other than on a “Casual Friday” and when clients are not present.

Indeed, at one place that I consulted, Casual Friday was considered a sports jacket and a tie…….

Professionals have to remain professional.