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Perhaps because of its common name many people still believe that not getting dressed warm enough when they go outside increases their chances of catching a cold. The explanation here as the same as in the previous one: Only a cold virus causes a cold. People tend to stay inside when it’s cold out and they are usually not alone. Therefore, being in contact with more people – and possibly touching the doorknob unaware of the fact that someone had just sneezed and touched the same surface – is likely the reason why you’re sick, not leaving the hat at home.