So if someone, for whatever (obviously nefarious) reason, wears a non-white shirt he’s not begeder ben Torah anymore?
Wish I could find and link this, but last year sometime there was an incredible story in Yated about a Shuvu school and how the founder ran in to Shabbos, in a shul in the Shuvu city, in his painting clothes, and the brachos he got from the rebbe in whose shul he davened.
I personally don’t see not wearing a white shirt as something “off”, that we have to be dan lekaf zechus over, but for those who do, please be dan lekaf zechus as often as possible.