Workplace Advancement Act This bill amends the Fair Labor Standards Act of 1938 to prohibit discharging or retaliating against any employee because such employee has inquired about, discussed, or disclosed comparative compensation information for the purpose of determining whether the employer is compensating an employee in a manner that provides equal pay for equal work. The prohibition does not apply to instances in which an employee who has access to the wage information of other employees as a part of the employee's job functions discloses such wages to an individual who has no access to them, except in response to a charge or complaint or in furtherance of an investigation, proceeding, hearing, or action with respect to prohibited sex discrimination, including an investigation conducted by the employer. It is the sense of Congress that: (1) gender-based discrimination in wages or compensation violates existing law, and (2) Congress recommits itself to the principles of equal pay for equal work.