Miss Universe 2018 National Costumes
Albania
Trejsi Sejdini
Angola
Ana Liliana Avião
Argentina
Agustina Pivowarchuk
Armenia
Eliza Muradyan
Aruba
Kimberly Julsing
Australia
Francesca Hung
The Bahamas
Danielle Grant
Barbados
Meghan Theobalds
Belgium
Zoé Brunet
Belize
Jenelli Fraser
Bolivia
Joyce Prado
Brazil
Mayra Dia
British Virgin Islands
A’yana Keshelle Phillips
Bulgaria
Gabriela Topalova
Cambodia
Nat Rern
Canada
Marta Stepien
Cayman Islands
Caitlin Tyson
Chile
Andrea Díaz
China
Meisu Qin
Colombia
Valeria Morales
Costa Rica
Natalia Carvajal
Croatia
Mia Pojatina
Curaçao
Akisha Albert
Czech Republic
Lea Šteflíčková
Denmark
Helena Heuser
Dominican Republic
Aldy Bernard
Ecuador
Virginia Limongi
Egypt
Nariman Khaled
El Salvador
Marisela de Montecristo
Finland
Alina Voronkova
France
Eva Colas
Georgia
Lara Yan
Germany
Celine Willers
Ghana
Diata Hoggar
Greece
Ioanna Bella
Guam
Athena Su McNinch
Guatemala
Mariana García
Haiti
Samantha Colas
Honduras
Vanessa Villars
Hungary
Enikő Kecskès
Iceland
Katrín Lea Elenudóttir
India
Nehal Chudasama
Indonesia
Sonia Fergina Citrag
Ireland
Grainne Gallanagha
Israel
Nikol Reznikov
Jamaica
Emily Maddison
Japan
Yuumi Kato
Kazakhstan
Sabina Azimbayeva
Kenya
Wabaiya Kariuki
Kosovo
Zana Berisha
Kyrgyzstan
Begimay Karybekova
Laos
On-anong Homsombath
Lebanon
Maya Reaidy
Malaysia
Jane Teoh
Malta
Francesca Mifsud
Mauritius
Varsha Ragoobarsing
Mexico
Andrea Toscano
Mongolia
Dolgion Delgerjav
Myanmar
Hnin Thway Yu Aung
Namibia
Selma Kamanya
Nepal
Manita Devkota
Netherlands
Rahima Dirkse
New Zealand
Estelle Curd
Nicaragua
Adriana Paniagua
Nigeria
Aramide Lopez
Norway
Susanne Guttorm
Panama
Rosa Montezuma
Paraguay
Belén Alderete
Peru
Romina Lozano
Philippines
Catriona Gray
Poland
Magdalena Swat
Portugal
Filipa Barroso
Puerto Rico
Kiara Ortega
Russia
Yulia Polyachikhina
Saint Lucia
Angella Dalsou
Singapore
Zahra Khanum
Slovakia
Barbora Hanová
South Africa
Tamaryn Green
South Korea
Ji Hyun Baek
Spain
Angela Ponce
Sri Lanka
Ornella Gunesekere
Sweden
Emma Strandberg
Switzerland
Jastina Doreen Riederer
Thailand
Sophida Kanchanarin
Turkey
Tara De Vries
Ukraine
Karyna Zhosan
United Kingdom
Dee-Ann Kentish-Rogers
United States
Sarah Rose Summers
United States Virgin Islands
Aniska Tonge
Uruguay
Sofía Marreros
Venezuela
Sthefany Gutiérrez
Vietnam
H'Hen Niê
Zambia
Melba Shakabozha
The only costume I wasn't able to find was Miss Italy's. Miss Universe 2018 itself airs live on Sunday at 7:00 PM ET on Fox.
Sources 1, 2, 3