white dress with long sleeves formal sleeve Long Sleeve White Chiffon Long Formal Dress Off White / Large This twirly dress kicks things off with a sultry wrap bodice and long sheer sleeves (with gathering at the shoulder and covered button detail along the cuffs) Lulus | White Pleated Long

The daring leg slit offers a modern edge, making this gown perfect for any glamorous occasion

It was there that the Princess of Wales also wore her pearl jewelry from Jewish designer Susan Caplan, subtly honoring Holocaust victims with her significant choice of accessory

Find other colors here -The Best Curve Bias Cut Slip Dress | Luxury Plus Size Slip Dress Sante Grace

If I wanted to dress down a sport coat/shirt combo, Id simply wear the top 3 buttons unfastened (as youve done in the photographs above, but without the T-shirt), or replace the shirt with a polo that has a proper cutaway shirt collar (I really like the ones from Drumohr)