To record the history of the bra, Mark and Spencer raided its archives. Clothing from 1920 and decades Old ads are 70,000 from retailers- A strong collection of historical relics. The company claimed to have introduced cup sizes to UK consumers 50 years ago and held a lecture on Discovery in Leeds, where M & S was founded. Archivist Katie Cameron says the activities of the City Museum give a \"glimpse\" of past innovations \". According to the company\'s website, the company launched small, medium and large cups in 1951, \"which doesn\'t have much room for women of different sizes,\" said Cameron MS. 18 years before the company launched-DD sizes. MS Cameron said the speech would highlight the ever-changing style and design innovation that has been going on for decades. \"All kinds of changes have taken place,\" she said . \". The 69-year-old sister and experienced M & S shopper, Janet Roche, and Kay Susan barantan, 71, recalled the first time they wore a bra. Mrs. Roche said: \"The bras were more or less the same at that time, and now you can choose different sizes and styles, such as the matron and other things. \"You haven\'t had such a thing a long time ago. \"But I don\'t think you have thought about it, whether it\'s right or not. \"You didn\'t know the size of your cup at the time,\" added Mrs. Ballantyne . \". However, despite the innovative boasting, retailers are also required to do more in the search for a perfect fit. Professor Joanna Wakefield Scurr setting bra- The University of Portsmouth\'s testing research center says the size system has changed \"significantly\" over the years, with different precise measurements of all cup sizes in almost all retail stores. \"There is no generally accepted bra size and grading system. \"The size will vary from store to store,\" she said . \". \"This requires consistency, which is a real challenge for the bra industry. Nicola Johnson, head of courses at London Fashion Institute, said the industry \"saw a shift in the size of women\" and attached to Professor Wakefield -- Scurr calls for \"universal measurement \". \"Some brands are simplifying for themselves, but not for consumers,\" she said . \". \"If you are wearing a bra that doesn\'t fit, it can have a big impact on your health and can cause breast pain and breast tissue damage. \"More information about the M & S archives can be found here.