A quick stop to Sally Beauty and roughly $15 yielded this bizarre track of human hair. (Disclaimer: the platinum one (on the table) is acrylic! Woe to you who have naturally glowing locks. Disclaimer two! Do not under any circumstance wikipedia the process of harvesting these human hair extensions if you have even the slightest inclination that that sort of thing might make you squeamish...)
At first I wasn't quite sure what to do with it, because I really don't have confidence in my ability to sew, glue, weave, or otherwise attach this thing to my head in any permanent fashion. So, I did what any industrious girl who has no intentions of looking like Paris Hilton does with fake hair, and I ended up making a massive pony tail out of it! Marvelous! It's huge! Like a full-on second head!
Designers and artists speak all the time of things like proportion. Heads are not immune to these games of proportion.
And, just in case you have any desire to make it yourself (really? Let's be friends!) it's quite easy. Just buy one of the tracks of hair intended for sewing, and a little bottle of weave glue. Apply the weave glue to the tracks (the fabric-y part at the top) and fold the weave over itself in half, and then in half again, and again, until you have something that you can roughly manage to pin around your ponytail.