That is really interesting. I would have assumed they would have the same characteristics being of the same breed only different colors. So I went and pulled the standards used for judging to see.
Weight for females should be 3.40-4.80kg (7.5-10.5lb). Hatties is on the low side if not too small.
Feathers should be close to the body but not right next to the body. Plumage: Fairly profuse but close, not soft, loose and fluffy as in the Cochin, or close and hard as in the Game Fowl.
I guess our girls will not be winning any contests.