That means the same jacket that works well at work, will also be appropriate for a date or night out with friends.
A men’s capsule wardrobe is like a lean steak - there's very little fat, which in turn means everything has to pull double or triple duty. Having fewer clothes mean that you will be using items that will work in multiple scenarios, which will create a wardrobe that is both simple and versatile. That means the same jacket that works well at work, will also be appropriate for a date or night out with friends.