Where can I know the type of cultural clothing I need to abide by before I travel to an East-Asian country?

by movie

by search in google

read citizen culture there on website

by this country embassy on your city

Thanks for the invite, I apologize for the answer, leave the answer for the professionals.

Appreciate the invitation

Totally agree with Colleague Ahmed Mohammad's answer

Modest clothes work everywhere, you'd only worry about dress code when it comes to holy places, night clubs and beaches..

Saree and Salwar Kameez for ladies are the traditional cultural dress code. Always a Woman who dressed in Saree will really look beautiful as well gain respect, please do not take it in a controversial way.  Thanks.

My sister precious fantastic because you educated while proud of its culture and respected by everyone, including changes while raking life make fun of him .vhafeza everyone on your culture and Elect the right ones ...

You can either check online using google for instance or ask your travel agency . 

CIA FACT BOOK - you can refer this to know everything about the country you want to travel.

You can also use Google to know more details.