This casual pairing of a white vertical striped long sleeve shirt and grey chinos is a never-failing option when you need to look dapper but have zero time to put together a look. If not sure about the footwear, introduce a pair of white leather boat shoes to this outfit. Clearly, it's easier to work through a hot weather afternoon in a light and breezy combo such as this one. Now that's how you keep it casual as you make your way through your teens.