This is a child's bikini purchased new in Hawaii at the end of 2024 for around 10,000 yen. It's from the brand mermaid & boo. It was used when the child was approximately 115-120 cm tall, and the size is likely S. It has been used less than 10 times and is in relatively good condition with no noticeable scratches or stains, as the child has outgrown it.