Grey mules fall somewhere between ballet flat and proper shoe, and it’s also why the good ones are so difficult to track down. There’s something about the colour that does most of the work for you: mid to dark grey looks more considered than black, softer than tan, and sidesteps that slightly try hard quality a bright shoe can have on an otherwise minimalist outfit. What really separates a mule worth owning from one you’ll leave at the back of your wardrobe is almost entirely down to the last and heel.
Backless shoes with no structure through the vamp will gape and slip with every step, so look for a heel counter that extends high enough at the back to stop it slipping off, or a vamp cut high enough to grip the foot without needing a strap. Leather, or a convincing leather look, holds its shape and creases naturally, whereas a stiff synthetic will start to crack across the toe within a few weeks of wear.
Heel height also governs how you wear the shoe. A kitten heel or low block heel around three to four centimetres is practical enough for tailoring and manageable for a full day on your feet. Anything taller turns the mule into evening wear, to be worn with a slip skirt or wide leg trouser that grazes the floor and shows the shoe off at the front. Pointed toes elongate the leg and work well with skinny trouser or a midi skirt, while square or almond toes are more flattering under wide-leg, cropped hems where a point would look stubby.
As for colour, grey works as a neutral in the truest sense. It sits easily against navy, camel, black and every shade of denim without that slight clash you sometimes get with a warmer neutral. Grey is particularly good with tonal grey and charcoal dressing; matching shades rather than exact colours stops anything looking too matchy-matchy. Pair with tailored trousers or a knee-length skirt and block heel for office-appropriate combinations, or dress it down with a slip dress or wide trouser and low block heel for evening. They’ll look pulled together without trying too hard. Grey is also your best bet when a smart casual dress code leaves you wondering how smart you should actually dress; grey promises polish without ever looking like you’ve overdressed for the room.
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