FORUM Women's One Size Purple Shimmer Stretch Bell Bottom Pants Mermaid Costume. Cute stretchy bell bottom pants for a mermaid costume. These would also make an excellent 60s or 70s Abba costume if worn as bell bottom pants. One size. Measurements are in pictures. I appreciate your business and strive for a five star rating. Please note returns are not accepted on Halloween. Item has been washed sanitized and is ready for the next owner. In great preowned condition with no obvious flaws.