Buttons and elastic in place. These were such a simple sew up and very quick even with the buttons and side vent details. Adding piping was also the work of only a moment. I love these children’s PDF’s as many of the pieces only need to be printed and not assembled. I’m looking forward to trying some more Oliver + S patterns. Any recommendations? Perhaps one more pair of sailboat pants for O? Have you made/seen any Sailboat pants for boys?