Shops put out their prom dresses for the new year as early as January. January is the time to get the best selections. Things get gone extremely quick in prom season. As soon as gowns hit the floor they are taken. The hottest new styles are usually the very first to go. So do not wait around until the best styles are picked over. Get a head start so that you will not get leftovers.
You also need to purchase early to make time for alterations if needed. A good seamstress starts scheduling alterations for prom in January. There are only a few good seamstresses and hundreds of girls going to prom in your area. You do the math!