They say the bride’s dress is the most anticipated fashion highlight in every high-profile wedding. Most ladies patiently wait for celebrity brides to walk down the aisle to get a glimpse of their gown and make notes for future reference.

However, this will not be the case in the upcoming royal wedding of Prince Harry and his fiancé Meghan Markle on Saturday. While there will be brides-to-be who will surely keep a close watch on Markle’s wedding gown, most people will probably talk about the hats that most of their guests will wear for the royal wedding.

The royal hats created lots of buzz when Prince William and Catherine, Duchess of Cambridge, got hitched in 2011, which apparently were said to be part of a very strict dress code for female guests at that time. Princess Beatrice of York put Lady Gaga to shame with her taupe O tacked to her forehead. Will’s cousin and her taupe O became so popular that she was able to raise $130,000 for charity when she sold the hat on eBay.

With Prince Harry and Meghan Markle’s wedding just two days away, bookmakers are now trying to predict the color of the hats that Queen Elizabeth and the Duchess of Cambridge will wear during the occasion.