These trade fashion plates were probably directed at a more mature market. The Tailleur 1965 book cover they come from states that the patterns were available only in UK size16 (Europe 44) and 20 (48) only.
The larger size 20 would have been aimed at the plus size fashion market then known as the Outsize Retail Trade. One major fashion store of the era and now called Evans used to be named Evans Outsizes. The suits and coats here do follow the general lines of the day, but should be regarded as more usually worn by groomed women rather than younger girls.