"Stately and elegant" is something a lot of women look like. Doesn't give impression of royalty.
Modern royalty dresses mostly in plain clothes anyway, I don't think there is such a thing as "modern royalty look".
That was kind of my point. She looks like she could be modern royalty who don't necessarily look like royalty in a "she's clearly a princess!" way, which fits FFXV's modern day inspired world. She seems to have a pretty plain white dress, yet she sits up straight and at least I get a sense of an air of dignity off her. Maybe the first thing you think about isn't that she is a royalty if you are shown a picture of her without context, but when you know that she is ~something like that in FFXV's modern-ish world, then her looks & what little we have seen of her demeanour fit that role.
EDIT: I'll agree that nowadays there isn't a definitive look for modern royalty (other than wearing a crown/tiara/whatever), but I'd say modern royalty never look like hobos or anything and there is often a kind of common look that a lot of royalty adhere to, but yeah, that look is not exclusive to royalty, but one which a lot of non-royalty do also have nowadays.
I was actually referring to the 'multiple days dungeons' bit. I didn't hear him talking about that in the event.
http://youtu.be/an2mkdwZXY4?t=8m46s
That said, I notice that he did say that around TGS a day was 30 minutes long, so I was wrong about 60 minutes having been the length for a longer time.