Natyashastra
अवहित्थं समाख्यातं स्थानमागमभूषणैः । स्त्रीणामेतत् स्मृतं स्थानं संलापे तु स्वभावजे ॥ १७०॥
This posture is called Avahittha, marked by natural grace and ornamentation. It is considered a natural posture for women, especially during conversation.
english translation
avahitthaM samAkhyAtaM sthAnamAgamabhUSaNaiH । strINAmetat smRtaM sthAnaM saMlApe tu svabhAvaje ॥ 170॥
hk transliteration by Sanscript