I know this has been expounded upon ITT but it really hammers home how male Kevin is that he brags about being a 44C and that half of that is padding. He has the most pathetic moobs if they aren't even an actual 44C at his weight and ribcage size.
44C != 36C. A 36C, proportionally, is fuller than a 44C. The number is band size (based on ribcage).
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To put into perspective, most stores only go from 30 to 38, though I sometimes see 28 - which would be pretty petite - up to 40 - which is stoutly plus size. A band size of 44 is like, morbidly obese for an average height woman (example of
an actual woman with a 44 band and a DDD cup size):
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Anyways to answer your last question, mtfs need their own
special sizing calculator because shockingly women's clothes aren't meant to accommodate male bodies.
If you ever get a chance searching for "amab" on r/abrathatfits is a fun romp. It's usually dudes
bragging about their 48B moobs and women either
gently trying to explain that their moobs are in two separate zip codes and bras weren't really designed for that and a male ribcage, or
saying it very bluntly (unsurprisingly the troon then dips in search of fairer fields from which to reap validation).
(Edit: links weren't working, so I fixed them.)