We need some British nipples! (+ fic)

We watched Mrs. Henderson Presents last night, and it had me wondering. What exactly is a British nipple? How is an Italian one different? I didn't realize that differences in nipples were due to nationality or ethnicity.
*pulls collar of shirt out and eyes nipples*
Hmm... wonder what category mine fall into?

Er... yeah. Sorry about that. *lets collar fall back to chest*

( Fic + minutiae )