Dress sizes are not a reliable indicator - measurements + height would be.
It's really funny when guys like you try to make out you know everything about the sizing of womens
clothing. Unless you cross-dress you couldn't know.
Sometimes I'm a size 8 (usually British-made stuff), at times a 10 (although 90% of time a 10 is too big), Occasionally I'm even a size 12 (European/American sizing like in shops such as Zara or Mango). Sometimes I can fit an age 11-12 as I'm petite
You cannot put all women into 'little boxes' . Look at the picture (any pic of a WG). Do you fancy the lady? If yes, cool. If no, move on.
Debating dress sizes is just stupid when they vary so much anyway.
I think most men and indeed people have a wider variation of who they will find attractive (thankfully)