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Contrast: 65% Polyester

Sophie O'Neil, a senior stylist at the U.K.-based online fashion retailer PrettyLittleThing, told Fox News Digital that wedding guests who wish to wear red on the big day should opt for a "modest" dress thats in a "darker silhouette" and doesnt have "overly revealing or flashy designs." "Wearing red to a wedding can often be seen as a risky move," O'Neil wrote in an email

The former footballer, now 49, tied the knot with the former Spice Girls member, now 50, in a 'fairytale' ceremony at Luttrellstown Castle in Ireland on July 4, 1999

Bold floral maxi We're obsessed with the gradient purple hues on this long summer wedding guest dress, which comes in sizes M to 6X