You can't go wrong with a staple T-shirt and the relaxed fabric balanced the formality of her embroidered ME+EM skirt ...

Related: Helen Mirren’s 7 Best Fashion Looks of All Time, According to a Celebrity Stylist A crisp white button-down is a staple as it’s clean, classic and polished, and it pairs well with long skirts ...

Forget the one-wear purchase, this season's most stylish wedding guests are choosing dresses that they'll turn to time and time again.