Take everything!
by Ash59
Depends upon where you go. If in the north of the country, then it can be hot and steamy; in the far south, it can be snowing and in the east, you can be blown off your feet by the wind. Best bet is lot of thin clothes that you can layer, depending upon how hot or cold it is. Take a hat that can be used as a sun hat or to keep your head warm. A good quality lightweight wind/rain/snow proof coat is a must for most of the country, yes, even up north where it is hot as they don't call it a rain forest for nothing!
From experience, due to the fact that the airline lost our baggage, I found that you can get most items from the shops in Argentina that you can get back home, even if they are called something totally different to what you are used to. Indeed, it can be quite fun trying to explain what you want to a Spanish speaking Argentian who obviously wants to help but does not understand...