I'd rather just have more hair styles available from the start without the need to unlock them with charisma. But honestly, I wouldn't want a DLC just to add new hairstyles anyway, it doesn't seem like enough to warrant being DLC to me. If they want us to pay for extra content, they'd better provide something that's worth paying for, and I just don't think a few new hair styles are worth paying for. If they're going to release downloadable content, they should release new quests or locations, though I wouldn't object if DLC adding that also came with new hairs, I guess.
It is unfortunate that there's no new hairstyles in the game, though, since that's a change I'd think they could easily make. If they can add many new models for enemies, weapons, armor, items, statics, and so on, I don't see why we couldn't get a few more hairs to choose from.
This actually makes alot of sense. People like to see well groomed face/hair.
But a hat may also be considered attractive under certain situations.