Eyebrows Over the Years: 1940s
1940s eyebrows were less dramatic than the rounded thin arches of the 30s. They were still plucked, but less severely. A slight arch with a point in the middle was coveted. After plucking, women would keep their brows in place with Vaseline. Famous actresses of the time wore this look, such as Lauren Bacall, Rita Hayworth, Ava Gardner, and Veronica Lake.
Modern 1940s Eyebrows
You can draw inspiration from this eyebrow trend like Reese Witherspoon did. Create a slight arch by plucking your eyebrows. Instead of using Vaseline like women of that time did, you can use clear mascara to keep your brows in shape. Also, to make them look more modern and natural, don't groom the ends of your eyebrows (near the inner corner of your eyes). This will keep them from looking too retro and too perfect.