midi denim dresses Reiss Button-Through Dress in Indigo Casual Lady Midi Denim A-Line

Although it is assumed that you would wear your black tuxedo with a bow tie, you do have the option to replace it with a black regular tie

Beautiful Blue Floral Mandela Bohemian Pattern on White Colour Base

Bieber wore a black Versace dress with an upside-down scoop neckline, a black-ribbon hair tie and layered pearl necklaces

You don't need to invent the wheel to finish your perfect bridal look, of course

For example, pairing jeans with polished calf leather will look more formal

Semi-formal wedding guest attire is essentially dressy-casual but a tad bit more fancy, bc, ya know, this is a wedding we're talking about here