They mean the same thing. "Attire" is a formal word, and "outfit" is a casual word. "Clothing" is a neutral word that would usually be used when talking about this. I would say "traditional Indonesian clothing" would be the most natural way to say it in American English.

Attire is a word that describes a genre of clothing, e.g. Traditional Indonesian attire or evening attire or casual attire. It refers to the whole wardrobe within that genre. It is also very formal. An Outfit is the collection of clothes worn by one person. For example, today I am wearing boots, jeans, a t-shirt and a cardigan, so that is my 'outfit' for today. Here is a sentence which I hope clears up the difference: "I chose a traditional Indonesian outfit from my mothers range of traditional Indonesian attire." As Sophia said, clothing is most commonly used in English for both meanings.

Thanks, Peter~ :)

`"Wanna" is not grammatical. "I want to..." is correct. If you use "wanna" it will give a very poor impression of your English proficiency and understanding of the language. As a rule, a non-native speaker should avoid using slang or other unconventional language until you are fully proficient in English.