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According to Princess Diana's stylist, Anna Harvey, the princess knew it was a daring choice and the dress had previously remained unworn for that very reason, though she had purchased it three years prior

"Perhaps it's an heirloom or ring, or something capable of keeping you grounded and comforted when you're in a setting that's sad or anxiety-inducing," she explains

Elegant Beaded Black Mermaid Long Sleeve Formal Dress (1X260) $270.75 USD (free shipping) Made to order, customizable

Finish off with a jacket or cardigan for seasonal versatility

This is the navy cotton dress you need in order to be a fair, storybook maiden

During an early preview of "It Ends with Us" in Grapevine, Texas, at which Lively, "It Ends With Us" author Colleen Hoover, and Lively's co-stars Brandon Sklenar and Isabela Ferrer surprised fans, Lively wore denim jeans with floral cutouts