The 40 contestants of the Bb. Pilipinas 2019 pageant participated in the national costume contest held at the New Frontier Theater in Quezon City. The contestants showcased various costumes ranging from ternos to ethnic including Igorot and Maranao costumes. Some used costumes celebrating the various festivities in the country.

At the end of the event the Top 10 national costumes were announced. The award for Best in National Costume will be given on the finals night. The Top 10 national costumes were:

Laguna-Leren Mae Bautista   

Pasig  -Maria Andrea Abesamis        

Negros Occidental-Vickie Rushton           

Masbate-Hannah Arnold           

Palawan-Samantha Mae Bernardo      

Bacolod-Cassandra Chan         

Cebu-Samantha Ashley Lo

Puerto Princesa-Jessarie Dumaguing  

Maguindanao-Resham Saeed           

Pampanga-Emma Mary Tiglao