You’re all hotties 😘

Don’t worry about being the flattest up top, Smolder baby. BIG ole booty.

Those measurements would make Yona - both tagged as ‘fat Yona’ and drawn as curvy with an adorable pot belly - as a US size 10; the average US woman is a size 14/16. Ocellus would drown in a US size 00.

It doesn’t really matter, given that the drawing is a much better guide to the artist’s intent for their proportions, but something tells me those numbers were plucked from the ether.

@ZhaoZoharEX
Right, that’s true. Now we just need underbust, and then bra sizes can be calculated.

@Liggliluff
Easy.

Blive
Wlaugh
Hlove

Okay serious, from what I understand it’s “bust, waist, and hip”. General clothing sizes rather than specifically bra sizes.

@ZhaoZoharEX
Great! But from this image, I don’t think we can calculate much since I have no idea what B, W and H stand for.

@ZhaoZoharEX
I come back to this comment about a year later and having learned and adopted metric in my daily life.

Funny how an image about bra sizes was one of the catalysts for that achievement.

Edit: Funny how I can now ask my wife what her bra size is and say “for research purposes” unironically.

Alicorns and yaks are the best choices.

@darthsylar12  
I did.  

So uh, did ya decide what the sizes were in Imperial? …asking for a friend.

@Liggliluff  
Thanks, I’ll try to decipher this information when I’m less sleep-deprived. I only have a vague idea of how big cup sizes are (even that’s based on fruit comparisons, honestly) and as an uncultured American, converting imperial to metric is sometimes confusing, mostly because as someone who doesn’t travel I don’t have a lot of practical reason to memorize the formulas.
 
I wish metric was standard.

@ZhaoZoharEX  
It’s actually very easy in metric; but online converters do give incorrect values thinking it works just like the confusing Imperial system.
 
Measure the circumference right below the breasts; this is your band size. Then measure the circumference across the breasts, subtract by the band size to get the difference. 13 cm difference is cup size A, and each letter adds 2 cm. Pick the cup closest to your value. That’s it.
 
65 cm under the breasts, 80 cm across the breasts. That’s 65 cm band size, and 15 cm size difference. This gives you 65B.
 
This online converter does give correct values, if you play around with it. But you need to read the value for “EU” below the big value. I have no idea what the big value is about.

I wish I better knew how bra sizes worked, metric or otherwise…

@InfiniteWarlock  
They really should include bust and underbust values, then you can calculate the cup size properly. In the case of metric; band size is underbust, and cup size is bust minus underbust, and A is 12–14 in difference, and increase 1 cup every 2 cm.
 
So I must now ask you. When you say Yona has a difference of 20 cm. Does that mean she has an underbust of 82 cm? The difference is small and gives a bra size of 80E, which would make Smolder’s 5 cm difference be too small for a bra. (Following the convention of using AA for a smaller A cup, she has 65AAAAA).
 
Looking at how you calculate a bra size in Imperial; you take the underbust minus 4,5 inches (11,43 cm). It looks like your values are based on the Imperial band size. So Yona actually have a difference of 31 cm? 70J.

@Liggliluff  
To be clear, I just converted the inches to the nearest cm for the comments on the bust size difference. You see numbers with bust-waist-hips on character sheets but unless you have a letter for cup size you’re sort of in the dark and have to make guesses on it. You only get cup size with the inclusion of a band size which charts like these don’t provide.

@InfiniteWarlock  
You have an interesting combination of metric units and imperial bra sizes. In metric it would be:  
90J, 90F, 75B, 80D
 
Assuming by 20 cm difference to bust size, you mean 7,9 inches bust to band size difference. Which results in a G cup and not H. But that is 31 cm in metric since you compare bust to underbust difference. Unless you did that correctly; but then that would be a D cup in metric and imperial, and be 3,4 inches bust to band size.
 
So I’m going to assume you used Imperial bra sizes, and just wrote in cm instead of inches.

So based on observations and some extrapolations from other charts for comparison, I can come to a calculated guess as to cup sizes based on these body types.  
Yona: 36H (H-Cup) _{20cm difference to bust size}  
Silverstream: 36DD (E-Cup) _{12-14cm difference to bust size}  
Smolder: 30B (B-Cup) _{5cm difference to bust size}  
Ocellus: 32C (C-Cup) _{7-9cm difference to bust size}

Ocellus: “Is professor Rarity done getting her measurements?”
 
Smolder: “It’s after school hours, just call her Rarity.”
 
Silverstream: “I wonder if she needs my seapony ones.”
 
Yona: “Yaks, we are better!”

@Spoonlol  
I see hippogriffs (and griffons, for that matter) having live births since their back halves are mammalian.

@Background Pony #ECA4  
I’m aware.

@Meanlucario  
You know Smolder dont have boobs in the cartoon- right? :) Its fanmade version. and it’s Anthropomorphic.

@Background Pony #ECA4  
I’m aware, but I can still ask for more “realistic” non-mammal species in fiction.

@Meanlucario  
Do you wonder why this “dragon” walks on 2 legs, can talk and fly with wings the size of a medium fan ? :)
 
I do get your point. But those all are “magical” creatures.  
You could call them hybrids. Maybe long long ago there was some human mixed in and those are the remnants of that age? Its like humans having a tailbone.

@Ocellus  
Other than it getting in their way while slithering around, it’s due to how their babies are hatched rather than born, meaning that they get the nutritions they need in their infant stage from that, where mammals (the group with breast and live birth) feed them through breast milk instead. You can connect the dots from there.

@Meanlucario  
No 😂