"When selecting a class to unlock, it seems to take into account the current gear they are wearing; so say someone could put on a "Maid Dress" to surpass the needed stats to get the 'Dancer' class, when without the dress they have less then 20 Charm. Fairly sure that is unintended?"
In the old game boosts to stats were taken into account when unlocking classes, so I personally assume (without knowing) that it is intended.
In the previous game, he had changed Beauty so that only base beauty was taken into account; I brought it back into line with the other stats myself. Whether this particular instance is intended or unintended in fact, I can only hope that it's as easy to fiddle with the stats and requirements in this game.