"Smart Fart" Underwear Invention

Kodi and two other students in her 8th grade Social Studies class had to come up with an invention. This is it:

"Smart Fart" underwear. Its purpose, two fold...
On the outside, it looks like regular underwear...

Discretely sewn on the inside is a special filter as it were. In theory, your fart will be filtered through the pocket containing the car-freshener, producing the sweet smell of a pine forest.

The second benefit from the filter is in the fabric of the special pocket. It is made from stain resistant material making your underwear skid-proof. With its fresh scent and absence of skid marks, it will be hard to know which pair is clean and which isn't...

Now, to market it to the world....why didn't I think of that???