Buying a Bra - What Size Cups Sir?

Front:
ENS AR 'WHAT SIZE CUPS-SIR?' 'DON'T KNOW LOVE BUT THEY JUST FIT, IN THIS BOWLER HAT!' 4855 be Teen Bra BRAS TO FIT SIZE Taylor

Back:
Published by BAMFORTH & CO., LTD., Holmfirth, Yorkshire "COMIC" Series No. 328 PREFERRED Bamforth POST OFFICE