As perennial wardrobe staples, khakis and chinos are among the fashion industry’s greatest inventions. Comfortable, versatile, and good looking, they can be dressed up or down and are appropriate for work and any number of occasions. But not if they’re wrinkled. And that has always been a major drawback to old-style cotton khakis: you can wear them only once or twice and then they’re likely to become a crumpled mess. And who wants…