Holo PAs change you to a different class, but its only body and face, not the hair. The hair is still that of the original class, which kind of defeats the original purpose of the PA.
Also the combination of Clothes and Face most times is really ugly (in my opinion) and nothing often seen on other chars, so its another giveaway of the PA.
Of course it would be nice if you could set a combination of stats for YOUR Holo PA, but thats more brainport than Bug Forum.