white as a lily: soft lily-white skin.
pure; untouched by corruption or imperfection; above reproach: He tries to pass himself off as some sort of lily-white saint, but he's not.
designating or pertaining to any faction, organization
, or group opposing the inclusion of blacks, especially in political or social life.
a member of a lily-white organization, especially a member of a former faction of the Republican party in the South opposed to the inclusion of blacks in the party or in political life in general.
1275–1325; Middle English lylie-whyt
3. segregated, discriminatory, unintegrated.