M&S Leather Cross-Strap Mule Shoes "The window for wearing backless shoes is getting narrower now, so I'm planning to take full advantage before the black tights come back out. These classic M&S Leather Cross-Strap Mule Shoes (£50) are perfect for dressing up jeans." — GC Image Source: Marks & Spencer M&S Leather Cross-Strap Mule Shoes £50 from marksandspencer.com Buy Now