Postal Service is honoring Barbie with a new series of 10 collectible stamps. USPS unveiled the stamps at the annual National Barbie Doll Collectors Convention in Austin, Texas. The stamps were unveiled earlier this month at the annual National Barbie Doll Collectors Convention in Austin, Texas. The nurse Barbie wears a white cotton nurse’s uniform with a graduate nurse’s cap, a blue cape and era-appropriate "cat-eye" glasses. Postal Service.