This is a paper hat from American Rag Cie. I purchased it at a physical store almost 10 years ago, but I never had a chance to wear it and it's been stored at home. I believe it was around 8,000 yen at the time. The size is free, and it can be adjusted with the inner string. I'm planning to move and considering getting rid of it, so please let me know if you're interested as soon as possible.