Unfortunately I can't claim today's post as my own. I had read this in a magazine a few years ago. I found it so simple and easy to follow, that I have to share it with you. Earlier today I was in a rush to get dressed so I couldn't spend my usual half an hour deciding what to wear. I had no choice but to revert what I call the "2:1 Colour Ratio".
Before I explain the ratio, let's assume every casual outfit comprises of three pieces: top, bottom and shoes. To keep it basic, let's stick with a t-shirt, jeans and sneakers. The colour ratio comes in as a foolproof method of colour matching which anyone can follow. Of course, you don't always have to do this, but it's safe and it works.
Simply pick two colours. Wear two of one colour and one of the other. A classic example is a white tee with blue jeans and white shoes.
Here's a couple of other examples:
Dressing 2:1 isn't essential, but it's an easy way to make ensure that your outfits are decently colour matched. My favourite combo is to match the top and shoes, so as to 'frame' the bottoms you may choose to wear.