Here are some examples of simple but classic plus size dresses that would work really well with the “suit dress” look. These dresses have clean lines and simple cuts, and would make a great work outfit. Put a classic black suit jacket over this dress and you’ll have a really nice casual business look. Your business attire wardrobe should consist of casual work clothes as well as formal women’s business suits. And having a couple of simple but classic dresses like these to wear under a suit jacket, gives more options to what you can do with your business suit.

I found these pretty dresses at OverStock.com