I wear polos all the time in late spring, summer, and even into the early days of autumn when it's still above 75*. Tucked, un-tucked, it depends on what pants I'm wearing. Jeans or chinos? Probably untucked. A crisp set of khakis? Tucked. Dress trousers? Tucked. If you're fit or even just skinny and the shirt is close fitting, it'll look good. Don't let a few morons that wear it badly ruin it. My preference for polos is solid colors, but some people wear stripes well. There have been some really good pictures posted that prove that the polo is a great piece of casual wear, and casual wear is supposed to be relaxed and easy.