This query is ambiguous and requires clarification. "My cup size is Stanley" doesn't refer to standard bra cup sizing. It seems to be using "Stanley" as a reference to a brand, likely Stanley Adventure Quenchers, which are popular insulated beverage containers. Therefore, the statement is likely a playful or ironic way of indicating the size of the cup being used, not a person's bra size. To provide a helpful answer, more context is needed.
