I am still watching an old episode and I realized that part of Jazz's problem is that female spines curve to accommodate pregnancy (and by default, additional tits, ass, and gut). This is apparently visible at birth and they can use this to identify the sex of a skeleton!
You see a usual big gorl walking and her spine is like an S and she's keeping the center of gravity low, slumped a bit, walking with her pelvis, and using every ounce of counterbalance from back and ass that she can muster, but you watch Jazz walk around and he's doing the man thing of trying to straighten his spine and stick his chest out to carry weight.
That must be an unusually tiring method.
Do I want to sperg? Should I sperg? Yea, let’s do it!
Let’s pretend this is an episode Bones and I am Dr Brennan. A skeleton was found so let’s investigate.
Number one way to tell sex from a skeleton: the pelvis!
Now let’s say the pelvis is missing because of animals, or let’s just say it’s been dispersed into pieces and cannot be located. If so, the elbow can work. Long bone measurements and skull can further determine gender.
Skull: square jaw shape, brow ridge (prominent n men, not women), the weight of skull, thickness of the bones themselves, blunt upper eye margins, frontal bone appearance, the angle of the jaw and so on will all indicate male or female.
More ambiguous features may indicate someone was intersex when looking at a skeleton. You can also get genetic material off the bones to test them.
Okay, let’s say the skull is missing in addition to pelvis. Let’s move on.
Femur slant. If the thigh bone slants at 18 degrees, it’s female. 13 degrees, male. Also, females have a more narrower ribcage, shorter torso and a carry angle in their shoulders.
Long story short, lots and lots of ways to tell biological sex based on the skeleton.
Transgender makes no difference in terms of skeletal changes. You either have a male skeleton, female, maybe intersex (rare) or a skeleton where you can’t tell for whatever reason. Thus, there’s no such thing as a trans skeleton, non binary skeleton etc. and, it is currently unknown what the long-term effects of puberty blockers and hormone replacement therapy are on the skeletons and general physiology of trans individuals.