Okay, I’m not an expert so take this with a grain of salt, but my understanding is:
Gender identity: your “brain sex”, determines what gender you are.
Gender expression: social stuff like your clothes, how you talk, and other things related to presentation. Doesn’t determine your gender.
Sex: in a social context, sex is more about primary and secondary sex characteristics and less about reproduction and chromosomes. Many secondary sex characteristics change with hormones, and primary ones can be changed via surgery.
Okay, I’m not an expert so take this with a grain of salt, but my understanding is:
Gender identity: your “brain sex”, determines what gender you are.
Gender expression: social stuff like your clothes, how you talk, and other things related to presentation. Doesn’t determine your gender.
Sex: in a social context, sex is more about primary and secondary sex characteristics and less about reproduction and chromosomes. Many secondary sex characteristics change with hormones, and primary ones can be changed via surgery.