What would you call this specific style of undergarment?

[zeekz]

I'm not talking about the undies itself, I am talking about the black garment.

On Monique Alexander

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I've seen several Twisty's set with models wearing them and am quite curious

 

[beepollen]

Garter belt.

 

[zeekz]

Garter belt.

Nice. Repped & Thanks.