As Matilda explained, it’s not everyday that either of them wears bright, poppy shoes. “It was a random choice and then we realized they looked like ketchup and mustard,” she said.

Vazquez likes using it as an accent color, so go for a bag or shoes in this hue. Daily To-Do Mustard Yellow Velvet Clutch, $28, Lulus . Lulus. INC Ruffled Cold-Shoulder Jumpsuit, $95, Macy's .

A mustard yellow belt, for instance, looks great on a casual suit. A pair of mustard shoes will bring a pop of colour to shirt-and-trousers combo. Shirt and T-shirt With a mustard shirt, the key ...