I think the beret looks amazing and I hope she wears more hats like that, additionally the black outfit and beret is a rare time when her hair looks immaculate. Looks like she brushed it and put in some product.
I think I'm finally understanding how some people are upset with her hair, etc... Because I don't think her hair looks good here because she "brushed it" and put product in it - I think it's because she used product and a flat iron to bump the ends of all of her layers and the look "stayed" because the weather cooperated with her.
With unpredictable weather, I think Meghan's hair has a tendency to frizz a bit at the ends - which just means the ends turn different angles and don't look "together". It also means the hair strands get thick, yet limp and just hang in an unflattering way.
So whereas a layered look would look great if curled properly - if the curl falls, the hair looks choppy instead.
I recognize it when I see it because when I wore my naturally kinky curly hair straight - as in relaxed - (and I have the same texture hair as Meghan based on pictures) and in layers - if I ran into any kind of foggy, humid or rainy weather, my hair would not behave properly.
All of a sudden, it would look like I just rolled out of bed instead of spending hours curling it from root to tip, etc... And no amount of product would make it not act up. The ends would start running in all different directions and when I had color in my hair, the very tips of my hair would "thicken" and stand out in a bad way - almost like the flat tip of the hair at the end had a "whitish" cap on the end of it that made my hair look very messy and like I needed a trim. It would also become really limp and lifeless and would NOT hold any kind of "bump" or curl from curlers or flat irons.
I think this is partly why we would see Meghan with the messier topknots - because she would realize she couldn't go with it out because it was just not working. So she probably would just do a quick topknot - at the last minute either in the car or right before they left.
The only way Meghan can avoid this hair situation is to:
1) Plan for it and just do a loose bun like she did last week
2) Get her hair cut all in one single layer
3) Wear her naturally curly hair
4) Reserve wearing her hair "out" for summer and less rainy seasons
Otherwise she'd have to flat iron her hair before EVERY engagement and use a ton of product and even then it might not actually work.
There is a chance that her hair will eventually adapt to the climate and then it will behave better, but that's going to take some time.