I have a question about this:
She was wearing slim black pants, black boots and a snug white blazer over an oxford shirt buttoned to the neck.
Is "buttoned to the <something>" a clothing industry jargon?
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It's not jargon. It's used by everyday people when discussing clothes:
Ladies, how do YOU wear your blouses with suit jackets: buttoned all the way to the top, slightly unbuttoned, unbuttoned and open, or very open?
— How High to Button Your Shirt for Interviews
Also "buttoned halfway":
You can wear them buttoned halfway or even wear them over a dress when it's chilly!
— Summer Knitwear is Trending - Blank Itinerary
Unless you're looking at something that says "buttoned down to" (which goes the other direction, and would be unusual for most clothes that I can think of, at least culturally), it means that the buttons, starting at the bottom, are buttoned up to the point specified (to the neck, to the top, halfway).
Similarly, we also talk about shoe laces:
Starting from the next higher set of eyelets, the second lace is similarly laced to the top of the shoe.
— Ian's Shoelace Site – Segmented Lacing