In this day and age, wearing and carrying flowers is not common and is reserved for special occasions like high school formals and weddings. As such, when it comes time to decide what is most appropriate or best, it is not always straightforward.
Because of this I find that one of the things I go over most often is explaining the difference between a corsage and a boutonniere.
So by definition a corsage is a floral bouquet (multi blooms) that is worn by a female. It is most common pinned or on the wrist. There are also novel or unconventional places to wear a corsage such as on the waist, shoe or on the shoulder.
The placement of the corsage and the type of design can be as simple as having it be in keeping with the overall colours of the wedding or can be specially chosen and designed for the wearer of the corsage.