Madeleine Vionnet Cocktail Dress 1920
The dress was made from one pattern piece with the centre front, back and sides falling on a perfect bias. Slits form the aperture for the head and arms. Fluted hanging sleeves and an uneven hemline accentuate the drape. Although other one piece constructions may have existed, this is the first one using the bias and in this case in all four directions of the quadrant.