I made a character in cc3 and used some daz3d clothes, this included a hat, most of the character was ok in ue4 except the hat and the shoes, these both had the head/feet coming through the hat/shoes whilst running in ue4. Is this something to do with the way I imported the hat/shoes?

Thanks for the reply but yea I did transfer the skin weight

Suggest you can submit the feedback ticket here, and provide your project on it(you can use private message to attach your file).
It will be helpful to solve your problem.