Little Lady Helen certainly looked bummed out at her cousin's wedding, didn't she?  Maybe it's because she didn't get to be in the bridal party like her cousins Sarah and Edward (though in hindsight, she should be thankful she didn't get stuck wearing this!)?  Or maybe it's because she's, you know, nine years old at a big, long, fancy royal wedding?

Either way, I love her little plaid hat.  I think it's safe to say that the hat's plaid matches that of the dress, which we can see in color here:

Perfect for a little future fashionista at a '70s Windsor soiree!  Love it!

Princess Margaret and her mum appear to have coordinated their outfits for Anne's wedding.  Here's a look at the neutral colors and brown fur from a color photograph:

Shiny, patterned fabric and brown fur -- 1970s all around!

ETA: A closer image, courtesy Jake.  No, Margaret, too shiny!  Egads!

Kate Kent, I see you there, peeking over the groom's shoulder!  (What is it with HRH's tendency to hide during group appearances?)  Interesting wide-brimmed number, just wish we could see it a bit better!

ETA: Hooray!  Jake tracked down some clearer images for us, so here's Kate, along with Sonja.  (The woman in the white hat is Anne Phillips, Mark's mother.)  It's PATTERNED.

One of the easiest royal hatters to pick out of the large group photo from Anne's wedding is, of course, our dear Queen Cake.  Rather unusual to see her in something that doesn't look like it was bought from a bakery, isn't it?  I quite like this silvery cossack-style hat on her.

ETA: A larger picture, courtesy the lovely Jake:

Here we've got the last appearance of Alice Athlone, one of the last surviving grandchildren of Queen Victoria, at a major British royal wedding.  She died in January 1981, so she didn't make it to see Charles and Di wed that summer.  In this photo, she's just over Prince Philip's shoulder.

Love the purple color and the slight floral-ness of the hat!  Here's a better view:

I like the general concept behind Sonja's chapeau here, but didn't anyone notice that it deflated in the car on the drive over to the Abbey?!?

Here's a look at the color of the hat, courtesy the group photo:

Sonja is in sky blue, just to the left of the groom.  Love the color!

Now here's a hatter I've just been dying to introduce to the blog on a proper occasion -- how about a little Princess Grace hattery, kids?

Only Grace Kelly herself would have the chutzpah to wear white at somebody else's wedding.  Technically, I believe this is what's called "winter white" -- but still!  She caught a good deal of grief back in '73 for this outfit.  The fur hat is lovely and oh-so-mod, but maybe a pale pink or blue would have been a little safer?

The Queen Mum's hat for her granddaughter's wedding was clearly made of two things: fur and leftover fabric from the curtains at Clarence House.  The upholstery nature of the topper is clearer from the back:

Good on QM for economizing, LOL!

Something about the way the back of this hat is draped has always reminded me of a nun's wimple, just a little bit.  A bright blue wimple, but a wimple nonetheless.  Here's the back:

I really like the idea of this hat, and I absolutely love the color, but it just doesn't quite do it for me.  What about the rest of you?

Sometimes I wonder if Lady Sarah has ever completely forgiven her cousin Anne for dressing her as Prince Valiant at this wedding...

(Also, check out Edward's excellent jaunty pose!)