Small buttons...what were they used for?

[NHDirtShark]

This year I have found several small buttons some as small as a pea. Very old for sure. I was wondering, what were tiny buttons used for?
Finding two of these in an old farm field today I can't help but wonder what practical purpose they served.

 

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[Chilli]

This year I have found several small buttons some as small as a pea. Very old for sure. I was wondering, what were tiny buttons used for?
Finding two of these in an old farm field today I can't help but wonder what practical purpose they served.

Hi. Perhaps from old button up boots!? They were pretty small.
We find lots of small buttons here from long johns and things like that but typically they are sow on with eyes not like those there.