A BOS T-shirt is included in the registration fee for pilots. Further T-shirts can be ordered using this form: https://docs.google.com/forms/d/e/1FAIpQLScnfWPm_kffOQagJu-TOqlmkUBvSydXD95QwmCLmjR9EF-qmw/viewform?usp=sharing
The T-shirt design is included in the above form. There are both male and female T-shirts available to order.