This is how Sasuke looks in the Naruto Shippuden Series.

When designing Sasuke in his Part II appearance, Kishimoto's (mangaka) main objective was to make him look cool. For this, he tried giving him several outfits such as a 'tsuna' around him to preserve Orochimaru's style of clothing; as by the moment in the series Sasuke was his apprentice.

Source:Wikipedia