Queen Opening of Parliament
Credit: Richard Pohle - WPA Pool/Getty Images

Try and think of a time you've ever seen Queen Elizabeth "dressed down." It's hard to even define that, but I'm betting it's not a weekend uniform of sweatpants and oversized wool socks.

But for this year's State Opening of Parliament – which is happening on June 19 — the Queen has made the decision to don her "day dress" and a hat. That last bit is important, considering she's historically worn the Imperial State Crown for the occasion. This is the first time in 43 years that she'll be ditching the crown in lieu of a more casual cap, according to The Telegraph. But don't worry, the crown will be in attendance.

The reason? You can blame the general election, which has caused a number of the opening's events to be rescheduled or canceled, including the Order of the Garter. The Trooping of Color — the official birthday celebration marking British sovereignty — is set to take place two days before the State Opening of Parliament, posing the real issue: an event with this level of planning requires too much rehearsal to time so closely to another event.

Here's a peek at what it looked like the last time Queen Elizabeth pulled out her day dress and hat for the State Opening of Parliament in 1974:

It's not just the Queen's appearance that will downplayed. Her transportation will get a bit of a downgrade — car in place of a carriage — and The Duke of Edinburgh will accompany her in a simple morning suit instead of full naval garb.

So, make sure to tune in for a rare chance to see Queen Elizabeth at a very important event in her "day dress and hat." And forgive me for forever calling my casual Fridays "day dress and hat" days.