Okay this is sooo simple. Its my go to, "I don't have time but want to look like I did" hair.
Hows that for an explaination?
Make a loop. You do this by not completely pulling your ponytail through.
Leave out a chunk of hair at the base of your scalp [see right]. Figure 1
Take that piece of hair and wrap it around your exposed ponytail.
Bobby pin your hair in place. Figure 2
Depending on how many layers you have you will need between 2-5 bobby pins.