CREATE TABLE table_21279 ("Country" TEXT, "Preliminary" TEXT, "Interview" TEXT, "Swimsuit" TEXT, "Evening Gown" TEXT, "Average" TEXT)

Evening gown scores of participants with 8.988 swimsuit score
SELECT "Evening Gown" FROM table_21279 WHERE "Swimsuit" = '8.988'
SELECT "Evening Gown" FROM "table_21279" WHERE "Swimsuit" = '8.988'