From pinterest.com/nettimms/16-17th-c/.
Here is the same dress seen in this image and this image, but from a different source. This could be called "amaranth red".
Keywords: 1650, Magdalena Sibylle von Preußen, Prinzessin des Herzogtums Preußen, Kurfürstin von Sachsen, Princess, Duchess, Hohenzollern family, Wettin family, German, fitted bodice, off shoulder scoop neckline, elbow length upper puffed sleeves, cuffs, waist band, vee waistline, full skirt