Maxima's personality makes her outfits work. It's clear just from looking a photos of the woman that she's lovely to be around. Those animated expressions, often being mirrored by those talking to her, are lovely and show she is comfortable in her own skin.
I'd like to see Meghan letting it all hang out a bit personality wise. I guess her training as an actor makes having tight control over your face and body second nature and hard to switch off.