Not sure what would actually fit Tessa Fowler (couldn't really find a size, since I could only find the 32H-27-31 measurement and I completely forgot what the other two numbers mean, IIRC, they were hips-width, but found none with those)
32H
The number is obviously in inches, so is it US or UK size? I mean, that's 3 inches/cup sizes difference.
The other number should be waist girth and hip girth
but I assume a 3XL, highest I could find was an 2XL, but the chest was one lower (ended at 26in) and the length was two shorter (ended at 29in).
What are these numbers?
2XL seems to be fitting for girls with 40 inches around the bust and 33 inches at the waist.
While a fitting bra always has to follow the same rules (not spilling out, not too loose, ...) this isn't the same for shirts. So it depends on what the shirt is intended to look like.
Just take two shirts of the same size. One is hip hop style which is loose and could also be considered to be a minidress while the other one is made of latex and meant to resemble a second skin...
So you can't quite see the difference if you don't know how it should look like
Though that actually doesn't matter in terms of comparing sizes in relation to each other.
The matter is how stretchy the fabric is. And the bigger the size, the less it needs to stretch from one size to another.
(If you have two elastic bands with lengths 10 inches and 5 inches and you stretch each by 1 inch, the 10" will be stretched by 10% while the 5" is stretched by 20%)
Now, if you the shirt is tight and not flexible, it might flatten the breasts.
if they sell 32GG bras in American stores
The US system basically counts up with single letters, so there is no GG but a matching size.
No idea if you can buy such sizes off the rack.
They look all the same (I use to use it as a visual aid before Tessa/using actual models).
That's promotional pictures which should make you buy the bras and not show how they look in different sizes. I guess they just take one model who shoots with a bunch of bras.
(would use another, if I could find another model with a size similar to hers, but the reasons could be off topic)
I guess Lucie Wilde (Busty Buffy) has a similar size though she is "listed" with 4 cup sizes more.