Go to a clothing store and pick out a dress and some panties you like, but make sure the panties are the wrong size.
Go to a change room and try them on.
Catch is - you’ve gotta leave the door/curtain slightly open.
Once you’ve tried them on, call someone over, hand them the panties, and tell them the panties are the wrong size, could they get the correct size.
Have fun!
|