A: Thank you for reaching out to us. To get a hat size, take the circumference in inches and divide by 3.14(pi). 23.5 is not quite a 7.5, which is where our sizing starts. This hat the buckets fit 7.75 to 8.5, so I think this will be a little bit too big for you. Please don't hesitate with any questions or how we may assist you.