Any ideas ?

[Electricbutter]

Looks like some kind of latch but for what? Thanks

 

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[jewelerguy]

looks about like the same type of closure that was on my over-shoes for rain/snow that I had when I was a kid

 

[old digger]

Agree, rubber boot snap.

 

[vhs07]

I think I had a rain coat as a kid in the '60's with snaps like that also.

 

[Spats]

I think I had a rain coat as a kid in the '60's with snaps like that also.

I bet it was yellow!