Suu Kyi has not yet commented on the sale of the sweater - a red, green and blue V-neck - or explained its background. It sold for 41,500,000 kyat, or $49,000.
The auction was part of a fundraising concert organized by the National League for Democracy party to raise money for education of poor children in the impoverished country.
Suu Kyi, a 67-year-old former political prisoner, has become Myanmar's biggest celebrity as the country transitions from a half-century of military rule.