What is the waist treatment called?

[debutanteclothing]

I'm brain dead and can't think of a proper way to describe this waist! All I can think of is cummerbund.

 

[dorotheascloset]

inset?

 

[debutanteclothing]

inverted V! That's what I was looking for. Thanks !

 

[pastperfect2]

Inset Midriff band?

Hollis

 

[Circa Vintage Clothing]

Nice frock!