white french cuff dress shirt Gitman Bros. Point Collar Pinpoint 18 / 32 100% Cotton Eton Contemporary Fit White French

To secure the top to not slip off your shoulder by chain away from each end of the top back part see pic below

Satin Back Bow Bodycon Dress This mini dress might look simple in the front, but it has a darling bow sitting at the small of the back thats perfect for over-the-shoulder photos

New Look Sewing Pattern Misses' Halter Dresses with Back Tie Item Number N6666 $5.99 Misses Dresses with thin shoulder straps and back tie detail

For a casual look , go for sneakers or desert boots

Thick chunkysoft ribbed knit, withsubtle pleatingat the shoulders, ballon sleevesshapes this long sleeve dress with a mock neckline

If you want to add an additional element to your look, you could throw a blazer or sportcoat over the top, but it's not required