Yeah not sure about that, we do all have different frames, and you look better with muscle at any weight. Not just heavier ones.
I do have a small frame, I could not give birth naturally, and knew I had to have a c section at 36 weeks, as my pelvis was too narrow for my baby to be delivered safely, to be blunt, she’d have got stuck.
my shoulders are narrow, my hips are narrow, my rib cage is narrow, my wrists are very small, my feet long and thin, but I’m quite tall at nearly 5ft 7. My daughter is the same, my mother and grandmother on my maternal side the same,
when I gained weight I became quite unwell the more over a healthy bmi I was. When I got to my peak at 32, my blood pressure was uncontrolled and I was on the max meds, I had sleep apnea, it wasn’t till my bmi got to 24 did I approach the healthy bp range again, and at bmi 2o its optimal. My body can’t cope with additional weight as my frame is small. It was the same in pregnancy
my friend is an inch taller than me, her bmi the same. A size ten will pull across her shoulders as they are wide, her rib cage wide. I can put a size 6 round mine, easily, I’m an eight, but my shoulders, ribs and hips can easily take a 6. We both have a lot of muscle.
so yes, frame is a thing, I can see it in my daughter, she is very narrow, it’s the only way to describe it, when born she was the top 5 percent for height. The bottom ten for weight, and she’s the same as a young adult.
it maybe an excuse for some, but thinking we all have the same skeletal structure I think is wrong.