Yeah, I'm kind of perplexed, to be honest. There's a huge, huge gap between size 20 and size 18.
When I wear size 20, I keep getting advised to stop wearing oversized clothes - and yet when I'm shopping, if I try to downsize to an 18, it's clearly much too small. It's like there's a complete size missing in between... I really don't understand it at all.
I haven't had this problem at all with the other sizes. Maybe it's because I've plateaued so long at this size that I'm redistributing weight or something and am now weirdly-shaped?
Anyway, for the moment I'll have to put up with the cries of 'Buy smaller clothes!', because much as I'd love to do just that, it's really just not happening yet!