with all the responses this seems to be a "warm" topic
i have to interject with one of my first big mistakes language wise down here during my first hot summer, when i went around introducing myself and saying, hola, me llamo david, soy caliente. thinking with the heat it was a bland, non-offensive way to start a conversation. little did i know for three months that "soy caliente' meant, i'm horny, not so much that i was hot !
but:
asking about cloths falls into a couple of categories
1. what to bring to fit the climate or what is a bargain to buy here so i dont bring it.
2. what is appropriate to fit the culture
3. what to wear and do so as not to be attractive to be a victim of crime
4. how to try and fit in so i dont get ripped off, and i will still maintain that no matter how one dresses, the minute you speak, if your not from buenos aires, they will know you are a tourist. (although to be fair, some of you really have learned the language and im jealous)
addendum
i personally find almost every where i've been in argentina to be very welcoming to me, as a foreigner (with a smile and an hola), and so far, to my low intellectual level, have not felt particularly "ripped off" anywhere.