There’s more to it than just losing stone / kg.
As others have said partly it is difficult to see yourself clearly and it works both ways. I was in denial about how big I was. I saw myself as a “thin person who was temporarily fat” (even though I’d been fat for 10+ years), also if I wore something that showed off my waist, I felt I was “skinny”, despite the blubber on my arms and my triple chins.
I’ve now lost 2 stone and I am now also a size 12. Sometimes I think I look great. Sometimes I feel like there is no difference, because in my head, this is the size I always was.
It really is difficult to see yourself clearly.
Secondly, it really is all about exercise and muscle tone, as much as it pains me to say it because I hate exercise. You can still be carrying a lot of fat and flab and you need to exercise to build muscle to get rid of this.
I have always been a big fan of Marilyn Monroe and think she was beautiful. But I heard somebody recently describe her as “skinny fat” and I see what they are saying.
Marilyn was from a time where women ate very little to preserve their figures. Also there were far fewer UPFs etc so she would have been eating a much cleaner diet, hence slim. But women then didn’t exercise much beyond normal lifestyle activities (they would have been less sedentary than today, but they were not strength training). Marilyn was actually ahead of her time as she was a keen jogger. So this would have burnt calories but it wouldnt have built muscle.
Hence she had a tummy and a softness to her. Which is where the “skinny fat” comment comes from.
At 10.7 stone / size 12 I am much bigger than MM, but my body composition is now probably similar. I need to firm up and tone up. And you probably do too.