I have read a quote, written by a fashion writer, from a 1960s newspaper. Here's an extract.
"I don't think our local girls are likely to fall for the masculine fashion of tailored trouser suits. Most girls are much too feminine to look their best in such attire - and [our winter weather] does not make a really heavy tweed trousered suit really necessary or comfortable. Of course, it all depends whether you want comfort or appearance. Trousers are splendid in the right place, but let us be feminine and appear helpless while we can."
As a child of that era I clearly remember being made aware that girls must be treated gently and formed the impression that this was partly due to their more delicate clothes. As a teenager without any sisters, I began to understand the truth of this when out with my first girlfriends. As well as being generally caring for their welfare and comfort I also learned that stockings were easily laddered, girls could not walk as fast as me because of their heels and skirts and they had to be careful how and where they sat to preserve their modesty. Helpless was putting it too strongly but it is interesting to read such a piece written by a woman only a few years before the revolution in clothing and attitudes which soon led to widespread acceptance of trousers for women and the feminist movement.
It would be interesting to know whether others who were around in that period have come across similar references to clothing being associated with women's vulnerability and femininity