Queen Elizabeth originally wore this dress adorned with the Scarlet Ibis and Cocrico, the Caribbean country's national birds, to a state dinner in Trinidad. The dress was 'recycled' for an event hosted by the Canadian government in honor of its Queen. The Queens dresser had maples leafs made of Swarovski crystals stitched onto the dress as a tribute to Canada. The Queen described it a 'a very useful dress'.
If I'm not mistaken, those are the same shoes too!