traditional dress in Vietnam

This is Vietnam's first ao dai (women's traditional tunic). 
This is a traditional dress in my country.
In high school, the girls have to wear it to school everyday.
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Áo dài Việt Nam ( trang phục truyền thống của phụ nữ)
Đây là trang phục truyền thống ở đất nước tôi.
Ở trường trung học, các cô gái phải mặc nó đến trường mỗi ngày

Remember to put articles before singular nouns. Articles such as "a" if the next word doesn't begin with a vowel like the word "traditional" and "an" if the next word does begin with a vowel such as "orange". However proper nouns like "Vietnam" are an exception to these rules. 

Also, you can take a look at these websites for more English grammar rules.

rules http://www.quickanddirtytips.com/education/grammar/when-to-use-articles-before-nouns

http://www.englishpage.com/

Take care, I hope that helps.