Mc Gregor & co what are they

[Unitedstatesofamerica1]

 

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[Mudflap]

Suspender hooks maybe??

 

[nhbenz]

These folks have really over-analyzed these things (garment hooks), with some pictures close enough (I think) near the bottom: Hook and Bar Closures - The Cutting Class

 

[Bigcypresshunter]