Let's face it, Tess always looks huge but dear god you never realise how huge until she's standing next to a normal sized woman. (And a beautiful one at that.) She's legit almost as wide as she is tall now.
So, taking the opportunity that both are side by side and standing straight, I took some screenshots cropped and measured, and took the waists to height ratios. Thinking that they aren't flat both this measurements are very generous because they aren't taking into account the sides of the body
The black girl gives me a 0.32, this would make her a Extremely Slim woman ( under 0.35, Marilyn was a 0.33) but if we take into account the lost of side (which, seeing her on profile when she turns, isn't much) it should raise her to the range of 0.35-0.41 which is a slim build
Tess gives me astounding .74, and well..there is a lot lost on the profile because we have seen her sides so yes I think her waist to height ratio might actually be 1 now
Edit: I went and did the sides too now, added it all up and black girl is 0.40
Now, hear this, Tess is 1.3, she is much more wider than she is tall, if we take her recorded height as true that would give us that her waist circumference is about 7 feet

And remember: they are both in heels