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Nothing poses a getting-ready quandary quite like black tie optional. Its vague and can result in guests wearing a hodgepodge of looks that are all over the map when it comes to levels of formality, Alexandra Macon, Vogue contributing editor and co-founder of wedding e-commerce site Over the Moon says

This elegant black maxi dress features a high neckline and feminine ruffle sleeves, crafted from 100% recycled polyester

I think an outfit like this can absolutely look nice for a birthday celebration, while still being practical and comfortable

People that dont see a point in paying for a black tie outfit, can get some kind of black tie that can be repurposed into other areas of life, or viceversa, like the example with the corduroy suit or the cream linen jacket