It depends. I am 5’4, a muscular hour glass build.
I was 8’2 in my late teens- it took me 800 cals a day and shit loads of exercise (i was a dancer) to get there.
While I don’t remember looking that thin, it was not maintainable. Normal exercise and eating has me about 9’4.
But oddly enough I have a very disordered body image and eating so I couldn’t honestly assess my own size and health. I saw myself as fat at 8 stone as I did at 12 after pregnancy. To me there is no difference in how I look, I’m always fat.