Brave Princess Kate Becomes First Mother in History to Wear All White to Playdate

When it comes to parent playdate fashions, the rules are simple: 1. keep it comfy; 2. keep it simple; 3. for the love of graham crackers and juice boxes, NEVER wear white.

Princess Kate, in a bold maneuver only a royal mom would attempt to pull off, flouted the rules and went with an all-white look for the family's much-anticipated playdate in Canada on Thursday.

While chasing nearly 17-month-old balloon-lovingPrincess Charlotte and 3-year-old Prince George, Kate opted for See by Chloé's pointelle-knit cotton-blend dress, which retails for $460.

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It's a departure from the red motif she's been wearing throughout the family's week-long tour of western Canada.

And in true princess style, it appears neither Kate nor Charlotte so much as smudged their picture-perfect looks – even with bunnies and dogs and bubbles and a big brother wielding a water gun. Which means today might go down as Kate's greatest fashion feat yet.