You can force her to wear one with clothing by including it in any of her Outfits and telling her to wear the outfit. Under the 'Good Manners' setting she must be allowed to wear helmets indoors or she will remove the wig indoors. She musn't have a helmet in her inventory with a higher armour rating. In normal usage and with her wardrobes on autochange she will only wear them when she is wearing armour, e.g. There are some restrictions when using them with Vilja. These wigs have an armour rating and are treated as helmets. Ponytails at the rear of the head and short hair with waving strands worked better generally, but not exclusively. I found the greatest clipping problems were with the ones that had extensions hanging from the side of the head, particularly in front of the shoulders or over the chest.

I found that some of these wigs did work quite well on the whole, but others had some fairly significant problems with clipping into the body, going into a frantic waving mode and stretching out horizontally to more than double their length. The moving hair really does look good - when it is working properly. The HDT plysics technology appears to be at an early stage still. I've been trying out the KS Hairdos with HDT physics wigs on Vilja plus a player character of my own along with some followers.

Smp+pe hdt physics extension