Good on you.
You're in California.
You're part of management, so you are the employer.
You have a progressive team. You mention the young people, but they're the ones who would be most accepting.
If you worked at a place that wasn't accepting you wouldn't want to work there anyway.
The outfit is pretty neutral and doesn't scream female. It says casual which is what someone working in an office on Saturday would likely wear.
You wanted to do it, you took the risk, nothing bad happened, and you wanted to share it here--but some here like to tsk tsk about every little risk people take.
Face it, you're happy you did it and plan on doing it again. Right?
Kudos for doing what you want to do and overcoming the fear.
