Here is the Lantern Sleeve Dress by Maternal America at Amazon.com. It's really cute, flattering to many figures, and relatively inexpensive at about $50 for the dress in gray and $60 for the dress in black. This dress would be great for a fun evening out with friends, Shabbat, a casual wedding, or a pre-baby date night. And, since it comes with a belt and there are buttons on the turtleneck, very little accessorizing is necessary. Just throw the dress on and you'll be ready to go out!
Please note that the description of the dress says that it's dry clean only. The dress is a rayon/spandex blend. Based on the material, I believe that it could be hand washed or washed on a delicate cycle in the washing machine. The only issue with these washing methods is that the dress would likely dry wrinkled. If you have a good steamer, it should take care of the wrinkles. Otherwise, you'll probably have to spend the money on dry cleaning when you need to clean the dress.
Please also note that Maternal America often sizes their clothing slightly smaller than Motherhood Maternity and A Pea in the Pod do. If you're in between letter sizes, you may want to consider sizing up (i.e. if you're a 6 you may want to consider purchasing the medium instead of the small).