A wireless brassiere with built-in shaping, lifting, and support system and methods includes, for example, a support band, an exterior support layer having lower edge portions connected to the support band and also having portions defining two concave shapes, an interior support layer having portions defining two breast cups and configured to be positioned between a front portion of the exterior support layer and the front of the torso of a wearer and also having lower edge portions connected to the support band. A continuous shoulder strap having an adjustable length includes a first portion that extends from the exterior support layer front portion to a slide coupled to a support band rear portion, loops slidably through the slide, and a second portion of the continuous shoulder strap extends from the slide to the interior support layer parallel with the first portion.