If you have your heart set on a certain corsage style or type of flower, then there is nothing wrong with letting your date know what you would like. You might even suggest going to the florist shop together to pick out your flowers.
Florists are experts at customization.
Or you can ask to see what ribbons he or she has on hand and choose one yourself. Flowers for your hair or neck or corsages pinned to an evening bag are also great choices. Talk to your florist about the options and ask to see photos of these different styles. It is important to remember that prom season is also peak wedding season and often falls on Mother's Day weekend. Therefore, popular flowers such as sweetheart roses, white roses and certain orchids used to create decorative body flowers are in high demand.