"but when they dig up your bones..."

I hear it said a lot that it doesn't matter what a transgender person does to change themselves when they're alive, because archeologists will determine their bones as their asab once they're dug up. As an aspiring archeologist myself... I can tell you these people know nothing about basic biology.

To tell the sex of a skeleton, we rely on sexual dimoprhism (the physical differences in biological men and women). Compared to the rest of the animal kingdom, humans show significantly low sexual dimporphism. Side note, the animal that shows the most is a northern giant seadevil. They're pretty cool.

Sexual dimorphism in humans is mostly concentrated in muscle mass and body fat, which all withers away long before you'll be dug up for archeological purposes. This leaves only the bones, which are measured on a scale of 1 (grasile- fem) to 5 (robust- masc), based mainly off of traits like pelvis width/shape and adult height. 

However, most humans lay in the 2-4 range, and it's VERY common for bodies to earn a 3 (sexual ambiguity). There's even been cases of biological females scoring a 5, and biological males scoring a 1. Additonally, certain populations (especially in Africa) have lower sexual dimorphism. 

In conclusion, skeletons are cool as fuck and it's usually actually pretty hard to correctly guess a skeleton's sex from it's bones alone.