Margot Robbie's definitely got a handle on her red carpet style, but we hadn't yet seen her at a wedding. That is, until she attended one with her boyfriend Tom Ackerley's family in Windsor. While there have been rumors swirling that the pair is engaged, we're just fine seeing them couple up at someone else's ceremony for now. After all, Margot exhibited two very tasteful looks, including one floral skirt set and a deep-red lace shift that she paired with pink wedges. Read on to see why Margot's got the right idea when it comes to mastering a Fall wedding look, then shop for similar pieces once you're feeling inspired.