I find the easiest time to add trim to the Jeanine Jumper is before sewing on the yoke. I pin the trim and sew a basting stitch along the top in a contrasting colour and then when I go to sew on the yoke I can see exactly where my stitching line should be for attaching the yoke! From there you carry on as per the directions!
Nice & simple and how cute doesn't mini pom-pom trim look on the Jeanine Jumper!?
and of course one of my favourite features to this pattern is that back! Kids can get in and out on their own - no help needed, even at 3 :) Snap crotch option from 3/6m up to the 3/4 size.