Carnation boutonnieres are easy to make. It is a very durable flower that often is shortchanged in the flower market, being scorned for being too common.
The carnation come in a wonderful array of different colors and has a light, pleasing scent. You should wire every flower that you use in both corsages and boutonnieres because it gives you more control over the flower head and decreases the dreaded "snapped head" in which a flower head is broken off at the stem of the boutonniere.
I typically use a 26 gauge green florist wire in my cut flower designs. Cut it in half with a pair of wire cutters.
I cut my carnations stems short and allow the wire to become the flower stem.