The purpose of this project is to demonstrate the design process using a one-piece pattern design to create an elegant draped dress with bias seams. Aesthetically, this project is a medley of various factors (bias seams, lack of side seams, and one-piece-pattern), brought together through two theories: the Grecian design principle and Madeleine Vionnet's's bias cut. This diamond cut dress design is the result of a pilot study to explore the possibilities to use a diamond shape line to replace side seams and the waistline. Due to the complicated seams, tucks and dart, three samples were tested to complete a modified pattern. This design is based on the classic Grecian design principle of draping without traditional side seams. Side seams are replaced by bias seams such as Vionnet's bias cut effect. Additionally, this design is an attempt to develop a better system of using draping and drafting successfully and efficiently.