chasidParticipant
Wearing simple clothing means you do not need to spend time worrying about how this colored shirt looks on you vs another. It allows one to focus on what’s inside vs the outside. In Chabad chasidus lingo: pnimiyus vs chitzoniyus.
In Chabad it used to be acceptable to wear colored shirts, because it was assumed that bochurim we’re penimiyus and didn’t care either way. That has changed, and all yeshivas bow require white shirts.
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With your line of thinking why not just dress in one colir throughout.all blue, all white , all black all brown and to make it even easier , institute a dress code of a full blown wrap.
No pockets to hide stuff no issue with tznius length by women. Why bother with black and white?