Going to the prom can be an expensive decision, especially if your family is on a budget. I remember my sister's prom. She was so excited and wanted the perfect prom dress. Cheap prom dresses under 100 was what we were looking for. She wanted her hair and nails done too. That can be costly unless you do it yourself or find a beauty school and hire a student. We actually hit our local dollar store for accessories and nail appliques. For evening dresses with low backs, you can usually pick up material from the hem line or a matching scarf accessory to sew into the back area to cover it. You can also use a contrasting color fabric. Be sure to take the material from a 'natural' place so that it doesn't appear to be altered (e.g. skirt hem line, long, wide sleeves, etc). cheap prom dresses under 100 It is important to get them from companies that have a widespread knowledge in the fashion industry with the necessary experience. Knowing your body will also go a long...