The 1930s is when we really see women in trousers get their stride. It was still not accepted by the majority in the early part of the 1930s.
They were not widely worn, but by the mid 1930s it was acceptable for wear for sportswear. They’re mostly seen on campus, at the resort, and in other places if you lived in the warmer climates like Southern California or Florida.
In the second half of the 1930s, trousers really start going crazy. In 1939 it seemed everyone wanted them. There were lounging ones, playing ones, work ones, beach ones, pajamas… and sometimes even dinner outfits.
The late 1930s is playful, and trousers fit in perfectly with that ideal. Trousers were not meant to hug your butt. They really wanted them to fit like a skirt- skimming your hips and rear loosely, then falling to a low crotch, and splitting into a bifurcated garment.
Here below is a nice photo set that shows trousers’ styles of women from the 1930s.