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Select the corsage. Select custom pins. Ask about clothing layers, if needed. Position the corsage on the left side of the wearer's chest.
Choose the corsage color and type based upon the clothing of the wearer. Some people prefer to coordinate while others want more of a contrast. You can also choose the color and style of the ribbon as well. Think about size too.  A good corsage option might be a single white carnation surrounded by some greenery and a red or white thin ribbon.  Before you choose a pinned option, you may want to ask the recipient if they have any metal allergies. If so, they may be more comfortable with a wrist-worn corsage. Some corsages come with standard, plain pins included in the package. However, you can also buy pins with black heads or even pearl ones. Just make sure that you buy a high quality pin so that it will not break under the pressure of holding up the corsage. If the wearer has multiple layers on you will need to decide how many to go through to keep the corsage in place. Ask the wearer if they plan to remove the outer layers at any point. If not, pin through as many as you need for stability. For example, a woman may be wearing a shawl that she plans to remove prior to the main event. If so, pull the top layer of fabric aside to clear a space for pinning. A corsage is typically placed about 4 inches down from the shoulder on the wearer's left. The bloom of the flower should face outward and the stem should be vertical. If you choose, you can slightly angle the stem to follow the lines of the outfit. Make sure to take into account any neckties or jewelry as you determine final placement.