Braids are also a good way to make a formal look out of a medium hairstyle. You do not need excessive length for braids and you can use multiple braids as well as different thicknesses. This type of hair style really lends itself to creativity.
One of the newer formal styles of hair are known as sedu hair. This is a slick and smooth finish to the hair. You use a straightening product to smooth the hair out.
A flat iron can and usually is also used to help achieve this effect. You can flip the hair out or curl it under in this type of hairdo. It is nice for medium hair as it does not need a certain type of length to achieve it the only key is the smooth look.