Is there muscle growth in you game? I'd love it if it were. In fact, I'd love just about any growth to be animated and in the game. Maybe you could limit armor for characters who can fit in it, as a sort of balance.
What do you think?
For muscle growth, you can drink the metamorphosis potion. An increase in some muscles adds +1 parameter Strength.
About the limit armor, I'm not sure (if I understood you correctly), because I would like to have the opportunity for a male and female character to wear any clothes for more Customization.
I think it would be possible to add limit on the parameters. For example, if there is little parameter Strength, you cannot wear heavy armor.