Is the sheet parented? You need to make a constrained group.

Take a look at this dress, it is parented to Antonia's chest and the small red line is the constrained group I made to hold this dress on her.

What is important to,avoid to turn V4 AFTER your final simulation pose.

Turn the camera with Animation OFF when you check for details.

La vie est éternelle. L'amour est immortel.

“Dwell on the beauty of life. Watch the stars, and see yourself running with them.”
― Marcus Aurelius,