oh no! This could have happened during the cutting process where the lining ended up slightly longer than the main fabric, like if there was an unseen wrinkle or something. But we need a quick solution here! If you pull up the lining (let’s say from the general waistline area) and safety pin it into place does that help at all? If so, maybe just put in a few handsewn tacking stitches to hold it into place so you can wear it to your event and enjoy compliments while no one knows your secret.