Joseph
Your 2 paragraphs disagree with each other.
If I had a once in a lifetime meeting I would wear a suit and tie. No hat, no gartel, no tallies and no tefilin.
(If the president said I’d like you to wear tefilin I wouldn’t wear half a jacket)
Your second paragraph makes sense. We dress by convention. In the yeshiva community this is no tie (generally) a jacket and hat (often brim up).
Among those where this isn’t the standard there’s no reason to dress that way
Dy
Because it isn’t true.
Unless you are arguing for a suit and tie.
And if I went to the oval office in tefilin I wouldn’t wear half a jacket.