One of my favorite advisers is Schawna Shuh. She is a professional speaker and author who gives motivational advice. One of her segments is about dressing to make connections in business and she refers to it as the three C's.
First is color and we should all use color in our wardrobes when we are tring to make a positive impression. After all, our outfit and our appearance is for the benefit of others who see us. Therefore, using cheerful colors is a positive for others.
The second C is comfortable. Your clothing should be comfortable for the situation. Your selection of your outfit should be appropriate for your current engagement whatever that might be. Nobody should be made to feel uncomfortable because of what you are wearing.
And the final C is for cover up. In a business or formal situation, it is always best to do so. This is fairly self explanatory. All of this advice is designed to help individuals to connect better with others in both business and professional situations.
I find it very helpful to seek the advice of career professionals and do it often through reading books and audio books. It is a great way to learn.