Is "hanbok" considered a countable noun, or an uncountable noun?
I assumed that "hanbok" meant a specific clothing item, and is therefore countable, and therefore "she wore a hanbok" would be proper English. However, the English language Wikipedia article on hanbok talks about it being
... clothing of the Joseon period and is worn as semi-formal or formal wear during traditional festivals and celebrations ...
as if it's a class of clothing, and later on has
Hanbok is classified according to its purposes
rather than "Hanboks are".
I also notice that the article doesn't use "Hanboks" anywhere, but that's not surprising as sometimes people don't pluralise words from certain languages.
If the word is used differently by different people, that's an acceptable answer.