You may be surprised to hear this, but fit is more important than even what you choose to wear, because if whatever you wear fits you well or properly and is true to your individual size, then it’s going to be hard for you to look bad.
But what is “Fit”? Just because you can button or zip into something, does not mean that it fits. And you can’t go by a standard size like say a size 8, because with various brands and manufacturers, the sizing differs greatly. Unfortunately, there is not much of a standard nor a law in the fashion world when it comes to sizing, which is something you’ve probably noticed as with one brand you might be a size 8, and in another a size 12.
How to Achieve a “True Fit”:
Firstly, knowing how a particular garment should drape and fit on your body is a big part of it, and there is a big difference between something tailored to fit your body, and something plastered on, there are some clothes that are so tight that it looks like the wearer had to use grease to slip into them!