I like this painting a lot.
It’s called Madam Récamier by François Gérard
There are many versions of ‘Madam Récamier’ who was a popular woman at that time in Paris and posed for many of these versions. She was known to be openly against Napoleon.
You might know the version made by Jacques-Louis David which is known to be one of the major pieces indicating the Empiricist art style that originated after the French Revolution.
The style is dominated by simplicity and a return to classicism. After the french revolution of 1789, people abhorred the extravagant lives and clothes of the upper class. They wanted to turn away from frivolous wealth and return to the much admired period of the ancient Greeks.
In their fashion, women started imitating the statues of ancient Greek ladies and goddesses, resulting in them wearing long place colored dresses, sometimes so transparent that it required them to wear white or pink tights underneath.
Sometimes they wetted or damped the dresses to make them stick to their bodies as they saw in the statues.
Personally I’ve always found this very amusing because Greek clothes were often colored brilliantly and covered in patterns (except those of the poor). Their statues were painted the same way but because after many years the paint had worn off the statues, people thought for a very long time that their clothes were simple and white.