This laid-back combination of a denim jacket and a grey long sleeve shirt is a life saver when you need to look casually cool but have no time to spare. Introduce a pair of dark brown leather desert boots to the equation and off you go looking boss. Dressing warmly is the trick to surviving cold temperatures, but this outfit is a clear example that this can also be done with style. As you can see here, in your 30s your dressing options are pretty much limitless.