(You totally do, but let’s pretend you totally don’t for a second.)
No. All you need is the clothes on your back.
As long as the clothes on your back come from this Fall Style Local Plunder. It’s a thing with pictures of nice fall-appropriate garments in it, and it’s right here.
So first, picture yourself raking leaves, going on hayrides and catapulting pumpkins. Then, picture yourself doing those things in new clothes.
This slideshow should help with that last part.