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Step 1: Position the Boutonniere
A boutonniere is always worn on the left lapel of a guys jacket.
A live flower and a sharp pins can be intimidating, not to mention standing kissably close to your date! But don't worry, it's simple to pin a boutonniere. There are a few different methods, but this one is the easiest: it only requires one pin and doesn't damage the head of the flower. To start, position the boutonniere on the left lapel of your date’s jacket, so the flower is facing up and the stem is facing down. Hold it in place.
Proms and Formal Dances Blog
Corsages and Boutonnieres