Dear Sue I think the buttons you are referring to were used on overalls and other protective work clothes. They were secured by a type of mini hair grip and could be removed for laundering so that the garment could be pressed by a press rather than ironing, then the buttons could be replaced. I had the plastic version of the buttons with these fasteners them down my lab coat in the 1960s and the holes the metal shanks of the buttons passed through were about 1/10 inch wide and neatened like buttonholes.
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