Excellent tip, @Theteapotsbrokenspout just checked and I will have to chase up my last return!
My brain's too Covid-y to contribute to the wise and lovely philosophical body image chat, but in brass tacks terms I just watched that instagrammer and that's not what I mean by short-waistedness. From dressmaking books, I learned to define it as the 'hinge point' of the body i.e. if you stand up straight then start to lean to one side and then the other, the points at which your body naturally starts to bend marks the waist. This is a bone structure thing so nothing to do with your belly button location or where your weight is distributed and it may not be the narrowest part of the torso.
If you are within an average height range, you can get an idea just from trying lots of clothes. I knew long before sewing that I had a long rise because I would need jeans labelled as high-rise or rib-cage to even look like a respectable mid-rise on me. Standard mid-rise cuts look like I'm trying to channel Y2K Britney / blend in with my students.