well... I LOVE putting tshirts and dresses on Remy and she would get so matted

Her coat always looked so stringy too. I cut her hair short. I left the legs and the head (I love pulling the hair up in a top knot). I was in a bit of shock after I did it, but she looks very cute in her outfits and doesn't matt as much. It has been awhile so it is growning back and I think the hairs looks more silky.
There are some yt who sell great pin brushes and grooming products. Look in the grooming section..
hope that helps