Black hat wb- the mahalach of Slabodka was to have kavod habriyos and appreciate that people were created btzelem Elokim. That doesn’t translate into having everyone look, dress, act, and speak in an identical fashion. There is no one mahalach for looking dignified. You can look dignified in a tuxedo if you are at a high class event, you can do look dignified in slacks and an ironed button down shirt if you are an engineer at work, or you can look dignified in your combat uniform if you are a soldier. White shirt, black pants, and no chup haircut is just what the frum world recognizes to be a dignified look for those who have no particular alternative dress code, but nobody ever said there is anything inherently dignified about the way frum ppl dress. If they lived a couple hundred years ago they would look foolish, and so would Moshe Rabeinu if he appeared today. To say someone doesn’t fit with Slabodka because he wears a certain color or parts his hair a certain way is plain old ignorance.
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