This two-part ponytail (also known as a stacked ponytail) will double your beauty pleasure! Not only is it a fantastic way to keep your hair off of your face and neck, it's also unconventional. In this photo, Jennifer Aniston is sporting a sort of well-hidden stacked ponytail. You can choose to hide the lower ponytail underneath the top one like she has, or if your hair is really straight, you can make the look more obvious by separating the two tails further apart. Either way, when your hair isn't cooperating and the standard simple ponytail won't do, this is a simple way to jazz up a basic ponytail.
read in more detail here: How-To: A Pretty And Chic Stacked Ponytail | BellaSugar - Beauty, Hair, & Skin.