White shirt and black tie
If you want to appear totally classic, go for a white shirt and a black tie. This is traditionally a formal look, but you can make it look more or less casual depending on how you wear it. For example, an elegant pair of cufflinks and a sleek hairstyle can dress up a black suit and black tie, whereas some leather bracelets and a disheveled hairdo (think Johnny Depp) can make it appear more casual.
Blue shirt and blue patterned tie
This combination is perfect for when you want to wear your black suit, but don’t want it to appear too dramatic. A good example of this would be at a job interview. A light to medium blue shirt will help to soften the look of the suit a bit. Look for a tie with the same shade of blue in it, along with other complimentary colors. For example, a foulard tie in shades of blue and green would work well, or a striped tie in blue, yellow and black.
White shirt and red, orange, or yellow tie
You’ve likely seen politicians in this combination before, and that is because it generally says “business.” This is a look that commands attention and respect. It is a good look to wear if you are heading up a business meeting or have an important presentation or proposal to make. And make sure your tie knots perfectly straight if you really want people to take you seriously.