Well, they say (and I'm not exactly sure who "they" are!) that a dress size is 10lb.
I don't think it is - on me, that is. But everyone's different. I've got what I consider to be a large frame (and the "fingers round the wrist" test confirms this) and I've always been heavier than I look. But I definitely don't go down a dress size for every 10lb. It seems more like about a stone and a half for a dress size.
Having said that, I'm now down about 5 dress sizes, in just under 6 stone.
However - and this is a big "however" - the last time I lost a lot of weight, I didn't exercise at all. And I got to within half a stone of where I am now, but I was still a size and a half bigger.
This time, I have been exercising as I've got slimmer, and I've obviously done lots more toning, and I'm a size I could never have believed I'd get to: about an 11 on the bottom, and a 13 on the top!
But interestingly, the inch loss never seems to have come at the same time as the pound loss.
So I'd say, probably, when you've got a lot to lose, the first couple of stone could come off without a really significant inch loss. As you lose a bit more, and get the energy to exercise a bit more, you may well find that the inch loss overtakes the pound loss.
But whatever happens, by losing this weight, you're going to feel AND look a hell of a lot better.
Keep at it - it really works!
(This is from someone with a massive grin on her face, because of achieving target last night: so I know it really does work!)