long sleeve off the shoulder sweater dress Ember Elevate your winter wardrobe with the Endless Rose Off Women's Leah Off The Shoulder

You want to look polished and respectful without attempting to match the immediate family's level of mourning attire

This maxi-length piece features a graceful off-shoulder neckline, paired with a lined bust for comfort and support

You can get the jacket with either two buttons or with 3-roll-2 buttoning (three buttons, with the lapel covering the top button)

Lane Bryant for plus size petite dresses

I have never been, but if you want a smarter occasion, then Glyndebourne might be something you would enjoy or alternatively a performance at one of the major European opera houses which are far more formal Vienna, La Scala etc