there are a couple combo hair/hats around. Maya's with the cowboy hat for one. I make the hat invisible and substitute something else. Also at RDNA there's a package called Ah Paris. I got it because it has a short hair/beret combo. I've substituted other things for the beret. something else I've tried is not-conforming, just parenting, then lowering the hair on the y-axis and putting a hat on top. Depends on the hair of course whether it will look good this way.