Sometimes they hold extra buttons, which seems generous and convenient, if perhaps and advance admission of guilt that the buttons fall off easily.
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Silvia Killingsworth

I can only speak for men’s apparel here, but the tradition of including spare buttons goes back quite a long way, and I don’t think it says anything about the quality of the stitching. Buttons can pop off for any numbers of reasons… your dog jumps upon you, you get snagged on a table or railing, years and years of repeated use, a frustrated sexy-time partner is too impatient…

They include the spares just to ensure that you have one that MATCHES perfectly, should you ever need it.

Think of it this way, on a blouse or a man’s oxford, if the buttons were poorly attached, what good would one or two spares do when there’s upwards of 5 on the shirt? Surely they don’t expect you to find them 80+% of the time if they fall off.

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