A boutonniere should be placed on the left lapel of a jacket, parallel to the outer seam, and right in the middle of the two seams. Specifically, the largest part of the flower should be placed over the buttonhole with the base of the flower where the ribbon-covered stem begins laying on the lapel below the buttonhole. The stem of the boutonniere should be aligned with the sides of the lapel so it angles in the same direction. If you are pinning the boutonniere on someone else, it should be placed to the right of the tie. The boutonniere is typically placed lower than the tie but above the pocket square.