The secret to them is in the ties located inside the leg hem. You can leave the ties undone and have long full pants, or tie them up and create the billowing bell at each leg. This feature also allows you to adjust the length as you need.
Free vintage inspired dress pattern from V Museum. I never knew they had free patterns!
https://flic.kr/p/4hRqbD | Vintage 1938 McCall Pattern Book | These vintage sewing patterns and images are from my personal collection. Please feel free to use them for Inspiration, for design reference, in your art etc., but please don't use them in collage sheets to sell or any other commercial purposes. Grazia Milla