There are many rules in fashion you can break but when it comes to bridal gown you should keep this rule - Choose the right hairstyle to compliment your gown. Formal dresses comes in many styles (a-line, sheath, empire) and one of the detail you should be aware of is the neckline. If you add unnecessary details to the neckline it can break the entire outfit. To make things easier for you, below is a guide for the best hairstyle and neckline combo.