Abstract: Systems and methods for stretch-forming multi-thickness composite skins are disclosed herein. The methods include locating a flexible support structure in a transition region that is defined by a charge of composite material and applying a vacuum to an interface between the charge of composite material and the flexible support structure to define a charge-support assembly. The methods also include separating the charge-support assembly from the layup surface and locating the charge-support assembly on a cure surface of a layup mandrel. The methods further include deforming the charge-support assembly on the cure surface to generate a conformed charge of composite material, releasing the vacuum, and separating the flexible support structure from conformed charge of composite material. The systems include systems that are configured to perform the methods.