Casual dresses and the dresses that people wear for work might be somewhat different from one another. People will not want the dresses that they wear at work to look overly fancy.
However, they are also not going to want these dresses to look like they are overly casual. Finding a balance between these two extremes can sometimes be tough for a lot of people. In a lot of cases, it all comes down to the material that people will use for these dresses. Many work dresses will be made from material that is tough, but still relatively flexible.
They will need to make sure that these are dresses that they will be able to wear comfortably all day at work. The dresses have to be just as presentable. People may be able to achieve this effect by a dress that has a fairly simple and restrained elegance