Country Girl/You walk into town.

From Create Your Own Story

There aren't a lot of people out where your stepdad's farm is, so you don't see any cars on the road. After you've walked for about an hour, you stop to rest for a minute and notice a loose thread hanging down from the bottom of your shirt. You grab the thread and try to pull it out. Of course, it's a lot longer than you expected, and when you pull the thread out you end up making the front of your shirt even shorter. Now it just barely covers your nipples, and with even the slightest movement one or both or your nipples pops into view.