I recognize you will find numerous apparent reasons you are able to think about that will make someone not need to stay out being an apparent tourist in Latin America–safety (crooks are far more prone to target an apparent tourist), social acceptance, not feeling stupid, simply attempting to merge by dressing from our fashion, etc.–but the very best reason isn’t any one of individuals, and it is one which requires a little of explaining and goes directly into the culture of South America, and contains related to poverty…
Normal people dress more formally in South America than elsewhere, and the reason behind this really is that the much, much bigger proportion of the human population is relatively poor compared to wealthy developed nations such as the U.S., Canada, and The European Union, and therefore it's not, rather than continues to be, considered fashionable to decorate lower in order to dress like you’re lesser than you're really.
Nobody wants to become wrongly identified as the cheapest lower class (South America is another a lot more class-centered society), nobody wears jeans which are deliberately torn (in case your jeans are torn it should be because you’re too poor to pay for brand new ones), nobody wears clothes which are baggy out on another fit (when they don’t fit, it should be since you can’t afford proper clothes which do fit properly), nobody dresses informally since it looks “cool” (since it doesn’t there), etc.
South America is definitely an very class-conscious society, and also the A-number-one of the ways that individuals communicate to everybody else that they’re respectable, not really a criminal, and never a violent delinquent is as simple as dressing as smartly so that as nicely as they possibly can possibly manage to.
Even inadequate individuals will still do that, they’ll own only one nice set of dress pants they put on each day and clean and iron each and every evening should they have to, just the worst from the worst don’t–they’re not snobs, this isn’t the west, it’s totally different from should you do that here.
Whenever you dress shabbily (shabbily by their standards, normal by ours), you’re associating yourself immediately with a few very ‘undesirable’ people who nobody else really wants to be connected with, individuals will do not be seen along with you and then any buddies you may make won't wish to be seen by helping cover their you and can be too polite to let you know that the dressing habits cause you to seem like a desperate heroin addict.
Please, before you begin shouting at me within the comments, realize that I am not saying you cannot put on what you would like, I am not telling you the way to decorate, I’m just saying people are likely to judge you for this and also you really cannot hold that against them since they’re just being normal (you’re within their culture, right?) and you’re the main one being strange, I’m just suggesting what’s socially acceptable and what’s not and why.
Just to illustrate how this could create problems, getting had this exact same experience associated with me by a number of hikers who may have had this take place in a number of different Latin American nations: you're going to get averted in the door at clubs as well as bars if you are putting on athletic shoes, or shorts, or perhaps a t-shirt (with no nice button-up shirt on the top from it), and sometimes even jeans, and god assist you to if you are putting on three or four of individuals.