Cantoresq.
We have been taught to dress up for shabbos not dress down. I agree that pushing the swing may be difficult in a 3 piece suit. But you have a dress down attitude towards Shabbos. The reason the generations have found going to shul so crucial on Shabbos is not because we have time since we aren’t working. But rather we aren’t working in order to be able to absorb and reconnect with Hashem. You realized that wearing shorts to shul would be inappropriate.
As a purveyor of Torah it also would bespoke proper decorum I am not discussing whether your attire was proper or not but whether that an attitude and of respect is appropriate and required.