Much has been written about a capsule wardrobe and it's still a mystery to many. But it's the recipe for getting dressed faster and more coherently.
Here's how I think of it. A capsule wardrobe means the pieces can easily be mixed together in a multitude of combinations because they are connected either by color palette or similar styles so the completed outfit looks related and complete.
I took this photo in a Suit Supply this weekend. Here, they've illustrated a neutral color palette (Cream, wheat, evergreen) with a combination of casual styles. What raises this up another level is that the quality of the fabrics is exceptional - even though it's almost imperceptible - but that level of quality IS discernable to the eye.
Another concept is that three (3) pieces of coordinated clothing look more pulled together than just throwing a shirt/blouse on top of pants. A two-piece look needs another piece to complete the concept and hold it together - to feel complete to the eye. That's often where a jacket or sweater (even thrown over the shoulders as in the photo above) adds some sartorial weight. This takes a casual look and makes it look more pulled together.
I'll be talking about this more in the future, so be thinking of what colors you have in your wardrobe and what you could add that would make the more compatible together!