The dress I wore is from the 40s, in a pretty heavy, slinky fabric. I bought it from Fanny.
It's a bit difficult to see in the photo, but the back has sort of a little bustle, and at the top there is a small opening that closes with a hook and eye.
On the inside of the sleeves there are zippers, which makes them sit perfectly around my skinny arms. I love this dress! It's one of those pieces that you can pretty much wear at any occasion, and the fact that I wore it to a funeral, won't stop me from wearing it to a party in the future!