The beauty of short cocktail dresses is that they are designed to be sexy, and that often means that they are not that durable or robust. They tend to be made of thin materials, some of which may even be see-thru. If you wash them in the washing machine, these dresses could rip and tear just from the way that they wrap around the other, more durable clothes. They could also be torn up if they catch on the inside of the washing machine.
You also do not want to throw these dresses in the dryer, where they could be ripped or shrunk. Instead, just take your dress outside and hang it on the line to dry. This takes longer, but it is much better for the material and makes it last.
Stay gorgeous everyone!