Table schema:
CREATE TABLE table_name_60 (evening_gown VARCHAR, preliminary VARCHAR, average VARCHAR, country VARCHAR)

Question: What is the evening gown number when the average is more than 8.984 in Louisiana and the preliminary is more than 8.597?
SQL: SELECT COUNT(evening_gown) FROM table_name_60 WHERE average > 8.984 AND country = "louisiana" AND preliminary > 8.597