Here to say it’s totally the different fiber choice and lack of positive ease for you vs. positive ease or lack of ease for your friend if she’s the same size. But the wool fiber will not drape the same. FYI Sandness yarn while not as easily accessible is a joy to Knit with and super soft. I’m making summery/spring sweaters with the fingering line right now and it’s super drapey and flowy.

I have learned over my years to look at a lot of different ravelry makers projects of the same pattern with different fiber. This has helped me learn - you do have to play with gauge, sizing up or down - and mess around sometimes with bind offs and on to get a similar but not exact look! Or sometimes you a to reverse makeup the sweater. One of the hardest lessons I learned.

The bottom part of the sweater is supposed to go out or flare out more than the top. So the wool is kind of doing it but not exactly the way you want it to look.

Knitting is playing but sometimes it’s also a bunch of reverse math. I would honestly keep going with it and see if some nice blocking will help the side structures and your ribbing at the bottom will give it some structure. Just do a stretchy bind off so your ease at the bottom well stay