Charisma Stat?

Charlatan’s robe (14) completely obscures maille chausses (17).
Yellow tunic (14) leaves part of maille chausses exposed.

There might also be some difference in cleanness even below that which ‘marks’ the clothing as dirty… plus maintenance perks might affect the total.

Charisma stat calculation process?
I did choose the Brute perk which does have a negative penalty on Charisma by -1. I’ve had my stat up to 14+ before based on the attire and armor and the +2 for carrying the mint leaves. With that said I was at the Sassau Monastery wearing only what they give you and had a score of 3.

My question is that at the time my stat base is a lowly 3 and is always far lower than my other stat scores.
Do we as players all have the same base stat scores and now differ from the choices we pick (IE. Perks and clothing /armor) or are they randomly generated?

There are no random stats in KCD. Charisma is an average of base (which I think is 6), visible clothes, their condition and cleanliness + any perks and other modifiers.