The hand size is not related to GID at all.
The average length of an adult male hand is 189 mm, while the average length of an adult female hand is 172 mm. The average hand breadth for adult males and females is 84 and 74 mm respectively
While mine are pretty much almost perfectly on the average female mark, I have seen people with LONG hands, then again they were taller than me and I seen regular females with HUGE hands, my grandmother has hands bigger than mine for example!
So did both of the cosmetician I worked with and my cousin from Holland! (but she has shoes one or two sizes smaller! tsk tsk)
HOWEVER, There is somewhat relation with the index and ring finger ratio, sometimes, but very much debated.
Sometimes the cause of trans is a too long androgen receptor gene, meanings, androgens have less effect on the body.
Another cause is not much of androgens while in the womb.
These two causes are two possible reasons, I think it's quite widely accepted among scientists that there may be more.
How this affects Index-Ring fingers ratio?
It had been researched that the more testosterone (or testosterone sensitivity) in the womb, the longer the ring finger turns out! this is why there is different digit ratio between most males and females.
This also predicts *MAY* behavior, as the testosterone *MAY* affect the masculinity of the brain,
It had been shown in a study that people with longer ring finger are more likely to be athletes, while longer index finger.. not so much.
If I remember correctly *this is strictly from memory*, it might also be related in a way to math skills. Long ring finger was related with better math skills.
Many of those results vary a lot with culture, environment, study habits etc..
A study found longer index finger is related with attraction to men, they concluded it doesn't show the person is gay, rather it shows a tendancy to be attracted to men, again this is probably mostly because of environment, culture, social norms etc.
They found that a high percentage of gay people had this finger ratio.
On the contrary, It was said males from Denmark used to have longer index fingers.
There is a criticism of that study - claiming they took drawing of the hands and measures from the drawing rather than the crest to the tip - if I remember properly.
This can produce false results.
So it seems there might be in actual relationship with this, but some studies suggest overlaps related to where you live or your genes, if the study about the males from Denmark was done properly, and we are pretty sure not most Danish are gay, it might be yet again just like the carrying angle of the arms which overlaps between the genders greatly.
So far, pretty much most guys if not all guys I tested for my own amusement had longer ring fingers, including my 2 brothers.
Oh! and I almost forgot, it seems that third childs have tendency to have longer index fingers, seems that there is almost always a bit less testosterone in the womb when it comes to that, but not always that much less.
In conclusion, I'd say stop looking for signs that make you more girly or manly, most of them are produced with the introduction of sex hormones or overlap too much.
The only major differences are the brain, the major sexual organs (uterus, womb, ovaries, vagina, penis, testicles), and later are the hip bones which grow with estrogen.
Male hormones do NOT affect skeletal structure, might affect a bit of the thickness although it is still unknown and might not at all!
In fact, in identifying of corpses, the only REALLY big indicator is the hip bones, which are developed with estrogen - probably if teh growth plates have not been sealed yet. If I remember correctly there are two (may be more) other tests, which are long bones and mandibles, but as I recall they overlap a lot and it's just that they may give a better idea of what it may was.
How tall you are and these kind of stuff are related to when your growth plate close, this is done by the estrogen hormone, females usually start puberty earlier and have more estrogen than males, therefore they are usually smaller.
In our times it is no longer completely true, many girls I have seen are much taller than I am. looking at the previous generation, women were short and usually had quite huge hips.
Then again it's hard to find a guy at my height too, 5'4-1/2 (I think.. I use metrics, that's 164)
A lot of hormones in our foods and drinks, smoking, alcohol habits and even obesity all seem to alter our growth now.
There is still indeed average height differences between the genders but it's no longer that hard to find women nearing 180cm tall.
What is important if you are going through HRT is the face, or a facial feminization surgery if needed, the voice - make it sound female, not to speak like a female like many suggest with breathiness, melody, bla bla bla - I heard people do that and it makes them sound more gay than female - make it sound like a female by pitch and resonance, and then speak in a feminine manner (although honestly, it won't matter if you get the other two right, you should see how some girls speak, it's worse than guys!), of course getting rid of facial hair also helps.
Even if you are flat but have a female face, people would see a person as female.
Hope it helped somehow
Edit: in relation to corpse identification I mentioned - there are some corpses yet with no recognized gender - just shows how clueless the skeleton might leave us.
The average hand sizes given are probably old and incorrect by about a decade if not two.
Although still seems to be somewhat correct for females, the male hands seems to have grown a lot bigger than the averages given there.
Many females have bigger hands than the averages given there it seems though not much bigger, yet many still have really small hands.
