What style/hair direction do you prefer?     

Free style     left part     center part    right part

 backwards    left crown     center crown     right crown    

Freestyle-having no built-in tendency.  Can be worn in most any style, even backwards.

Straight back- fine if you have a Swiss lace front. Otherwise you have to pull the hair forward a little and then turning it backward.  Freestyle pieces do this quite well.     

 Straight: no wave/curl

 Body wave                             Slight wave

Medium wave                 Tight wave

 Medium curl                     Tight curl

Or you can use cm or mm, for example 2.2 cm curl.