Characters
My girlfriend still doesn't know why her sweaters are always stretched out.
— Ed ‧ Ed Wood
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker reports that their girlfriend still cannot explain why her sweaters keep stretching. The wording hints that the speaker knows more than she does, turning an ordinary clothing problem into a concealed joke. The gap between her puzzlement and their knowledge supplies the teasing effect.
Context reviewed