Separate two sections of hair in front of your ears on either side of your head. (seventeen.com)
Then roll the tail up and pin to your head, moving it to the side, just in front of your ear. (harpersbazaar.com)
They're technically ear jackets because the shorter part goes in front of your ear lobe and the longer part goes behind, so it creates a multi-dimensional look. (brightonabudget.com)