(This is probably one of the best thread titles to ever hit the CR.)
Did our forefathers daven dressed as prescribed here,
by Rav Kanievsky, or anyone else?
That’s irrelevant, and that should be obvious.
Did [how they dressed] impact on their tefilos?
[…]
But unless you want to condemn those who you have no right condemning for doing it differently, please be less insistent about the practice of others when they are davening and talking to their God.
Whatever relativism you want to push, you cannot avoid the fact
that there are halachos about one’s manner of dress for tefillah,
whether you personally think it enhances one’s davening or not.
The subject is not an empty field to run around in.
As for you, Joseph…
A Yid should be wearing his hat anytime he’s on the street
and, in general, it should always be part of his uniform.
Depending on what community you come from, that could sound
anywhere from perfectly reasonable to totally off-the-wall.