I think it can get confusing because there are so many measures of what is or isn't overweight.
I don't much like BMI and from what I have read, that is increasingly true of the medical profession too. One person's 9.5st, even for the same height, will look completely different to another's because of bone structure/skeleton size, muscles tone, age, etc. At my lightest, I was 9.5st and a BMI of 20 apparently, and I was still wearing size 14 trousers because I have broad hips (they hung off me around the waist but that is true no matter what size I am), yet some people of my height (5ft 7in) can fit into an 8/10 at that weight. I wouldn't want to be lighter than that either because I didn't look good at that weight - I looked haggard and gaunt facially.
And despite what I have just said, I don't think clothes size is a good measure of size either. They vary so much from shop to shop, there is no gold standard of what a size 10, for example, actually is. I don't necessarily hold with the idea of vanity sizing either. I have a 30 yr old shirt, size 14, which I can still get into and wear, albeit with the bottom, hip level, button undone. I would have no hope of wearing a 14 now - I am an 18/20. Did shops not change the ratios a few years ago to accommodate the fact that hip/waist ratios are changing, rather than to trick us into feeling better about ourselves? It didn't work for me as a classic pear-shaped figure but less people are these days, perhaps because we are a more varied ethnic mix as a society, I don't know. Unfortunately I think if your perception of 'slim' is tied up with dress size rather than an objective look in the mirror, some people are going to suffer in terms of their self image as a result because you can always find a clothes in sizes bigger than you want to be even if your weight measurement doesn't change.
To me good measures of healthy weight are about waist measurements and hip to waist ratios but saying that doesn't have any impact if it is not what you see in the mirror. I think, no matter what size you are, if you are unhappy with yourself there will be some measurement somewhere which 'proves' your image of yourself as fat.
And just as an aside, I didn't think visceral fat necessarily shows up in our weight? You can have outwardly slim person with too much visceral fat and yet an overweight person with less visceral fat so it doesn't pay to be too complacent about you long term health if you are only going by weight or BMI.
Oh and it made me laugh when somebody said that touching your toes was a sign of fitness. I am the least fit I have ever been, I am several stone overweight, I am 47 yrs old and getting very creaky and I can not only touch my toes, I can also place the palms of my hands flat on the floor (no cheating, legs completely straight). I don't think it shows anything other than the fact I am perhaps blessed with longish arms! 