White against charcoal is a contrast that photographs well under bad airport lighting, which is most airport lighting. The relaxed fit has the most room of any cut in the lineup, built for the flight where you'd rather not think about your waistband until you land. This is the outfit for a full travel day — connection, layover, the works — where comfort has to outrank everything else without looking like you gave up. Comfortable pants for a long flight shouldn't mean showing up looking like you slept in them, even if you basically did.
Finish with white leather sneakers and a soft structured backpack.