Ray Batchelor writes:
“I knw nothing reliable about this image.

From a an American blog connected a jewellery business:

https://bellaargentinajewelry.wordpress.com/tag/old-tango-picture/

The blog author, Courtney Williams, writes: In the early nineteen teens, Tango had so taken Paris by storm that it soon became the hottest fashion in “cultured societies” around the globe.
These long mermaid style dresses allowed early Tango dancers to keep their torsos still while their feet could engage in graceful, increasingly complicated footwork and “adorno” flourishes.

She provides no source for this observation, so it has to be viewed as speculation, perhaps informed by dancing?”

What do you belive the copyright status of this image to be?
Ray Batchelor believes: “The image is out of copyright.”

The image url:
https://bellaargentinajewelry.files.wordpress.com/2014/03/tangoartnouveau.jpg