How to seam on reverse stockinette or pearl side

Hi Everyone:
I have just finished a sweater in reverse stockinette and have to join the seams now. I have finally got the knack of seaming on stockinette but do not really know how to do a neat finishing job when the pearl side is the outside. Any suggestions? I have had the sweater finished for a while but am procrastinating on the finishing.
Thanks a bunch! :??

To do a neat seam job on the purl side, you pick up the bottom loop of the purl stitch on one side and the top loop on the other side and do a mattress-like weaving back and forth. One of them is close to the edge, and one is a stitch in. I think it’s the top loop side that’s a stitch in.