I wasn't expecting full frontal nudity in a Capcom game, but still, not that bad.
While I can't confirm how the gear in this game will be, DD1 actually had a lot of robes that look similar to that one as well as more sexy or pretty gear. Also certain Vocations wear more revealing clothes than others. Sorcerer and Mages were for the most part dressed quite modestly, but there were some more alluring clothing. Starting gear was for the most part very plain and normal looking, sometimes even ugly, and it wasn't until further in the game you obtained more stylish gear. If you go to the DD2 webpage and check the vocation section you can see that certain vocations like Warrior and Trickster wear more skimpy clothes.
So for example, in DD1 you could have things like this
Alchemical Set, and compare to this
Sultry Set
In DD2, you have things like mages clothes
and Tricksters
The Sorcerer examples in the DD2's website seems to have a happy medium between the sexy gear of trickster and the more modest Mages