white satin dress with sleeves Silk Mini Long and open back with bow tie, Elegant Short Satin Dress for Civil Wedding, Elopement, Rehearsal Acetate Satin Silhouette Iris Long Sleeve Satin Maxi

PrettyLittleThing Shh, you didnt hear it from us, but PrettyLittleThing actually has some of the most unique pieces weve seen that wont break the bank

- Curved empire waist

Strapless frill mini dress

The sheer ruffle accents continue across the back and sleeves, giving the entire outfit a floaty, ghostlike presenceperfect for dancing, drifting, or dramatically exiting social functions

Also, while undoing a button or two might be fine on casual events, avoid doing so

While some people were quick to point out the fact that her outfit may have once again broken protocol, others noticed the subtle way she paid tribute to Princess Diana