I've never seen that, but I am completely mistrustful of label sizing - and it changes from country to country and era to era. I recommend checking the bust-waist-hips against a modern size chart for the country you are selling/presenting. I also like to check the shoulder to waist, about mid-shoulder, then straight down to belly button level. This will tell you if the torso is long enough for a taller person, someone with a larger bust, or if it is shorter than average, which would make it teen/juniors or petite. B 0 likely means something to the company, but how on earth are we supposed to know what that is! Which, could also mean it was a sample or second or had a factory defect.