I have flat bed knitting machines and have always loved the look of 
plating.  I wanted to do it on my circular knitting machines Addi King &
 Sentro so I did.
I think the natural roll of the purl side on to the knit side would make a nifty looking hat brim.  You can also play around with striping (I talk about it in the video towards the end).  I thought you might enjoy seeing how to do it.  hope you will try this and share with others. 
  Happy knitting!
https://www.youtube.com/watch?v=Nj8QkrZFBqo&fbclid=IwAR3cYo9zMzYOeLbU9n-AFjnqixoEXouDmJEctdECpK_6oeIdKiH1WsB18m4