Ginger is her own woman when she meets Fred. Throughout she shows her self independence and her goals. There is a change in who is or can be in control. The women in this movie are more self assured and opinionated.
The beautiful dresses and the attire in general does lend itself to realistic dress for the era. The romance of one couple vs Broadway stage movies is more personal to the audience.
I think with the depression women had to start work, take care of families and in some cases be the bread winner.