This portrait shows Louise Marguerite de Lorraine, Princess of Conti, wearing a dress with a jeweled bodice and jeweled sleeves.
Guide 2 Women in Power has this about her: "Daughter of Catherine, and married in 1605 to François de Bourbon, prince de Conti, first cousin of Henri IV of France (d. 1614 without issue). In 1629, she ceded Château-Regnault to the king of France in exchange for Pont-sur-Seine, and 3 years later she secretly married François de Bassompierre. The sovereignty of Château-Regnault included Linchamp, la Tour-à-Glaire, Macaucourt, Mohon, Montcy-Notre-Dame. In practice, since Château-Regnault is so small (it had 1200 inhabitants in the mid-19th c.), the substantial prerogative was the right to mint coins and excelled in copying coins from the neighbouring countries, and she minted coins with the titulature: 'Louise-Marguerite de Lorraine par la grâce de Dieu princesse souveraine de Château-Regnault.' She lived (1574-1631)."
Upgrade image posted 24 February 2015 from Wikimedia; spots and smears removed with Photoshop.