I'm 5'2" and about 177lbs (monthly weighday at the end of this week, so not exactly sure).
I wear a UK16, unless it's waisted, when it could be as big as a UK22.
My new jeans are UK14, and my new knickers are UK12.
At 236 I was UK26/28.
My bra size was 48C and is now 36F.
When I first started dieting, 45 years ago, a UK12 was the epitome of a good, slender but not skinny size. Now I'd probably aim for UK10, though at my height/shortness, even that won't be skinny skinny ~ but who wants to be bony!!