According to surviving auction listings from 2019 (via Heritage Auctions), the authentic "Birthday Gift Top" has distinct features:
The "Bettie Bondage: The Birthday Gift" top will always be remembered as an iconic piece of clothing that has left an indelible mark on the world of fashion and popular culture. Its influence continues to inspire new generations of fashion enthusiasts, and its timeless appeal lies in its bold and daring design. As a cultural icon, the "Bettie Bondage: The Birthday Gift" top remains a beloved and enduring symbol of the power of fashion. bettie bondage the birthday gift top