And with the speech including no fewer than eight bills regarding Britain's withdrawal from the European Union, we'd imagine the hats connotations were not lost on the Queen as she got ready this morning.
Foreign Secretary Boris Johnson said the visit by Mr Trump could not be included in the speech because no date had yet been fixed for the state occasion.
Mr Adams said: "After seeing the Queen wear a blue hat for her speech in Parliament, many punters expected her to remain in her clothing for Royal Ascot".
For the immediate future, it looks likely that the government will transpose the existing suite of European Union environmental laws into United Kingdom law, through the Repeal Bill, which government documents state will seek to provide "certainty for individuals and businesses" ahead of Brexit.
At the heart of this is the so-called Great Repeal Bill, which will repeal the 1972 European Communities Act and end the jurisdiction of the European Court of Justice.
She said her government would seek "to build the widest possible consensus on the country's future outside the European Union", amid divisions within her own cabinet over the best strategy.
"As prime minister, I apologise for that failure", she said.
Of the 27 proposed bills put forth in the speech, almost a third pertain to the U.K.'s departure from the European Union.
The speech is a list of laws that the British government plans to bring forward in the coming year.
The Queen had been seen at the State Opening of Parliament wearing blue, but by the time she arrived at the Berkshire racecourse she had changed into yellow.
We don't know which side of the Brexit debate she favors, but that didn't stop Twitter users from immediately interpreting what the headgear might mean.
But others expressed confusion, given the rumours that the queen is in fact in favour of leaving the EU.
The Queen's Speech took place on Wednesday and unsurprisingly it was dominated by Brexit.
"Given the Queen's compulsory nonpartisan role in the Brexit negotiations, the hat remains riddled with ambiguity", the Guardian newspaper wrote.
Queen Elizabeth II sure knows how to make a style statement - and today, she stepped out in two eye-catching ensembles for two important engagements.