One thing I notice with the jacket is the sleeves. A friend of mine was Richter Belmont from Castlevania (Link
) and if you look closely at the sleeves on Ragna and Belmont they have a similar shape at the shoulder. Anyway, for this jacket my honest opinion would be to browse McCall's website or their selection at Wal*Mart and JoAnns for a jacket pattern and just modify that. Maybe I'm just weird or something but personally I have a much
easier time modifying a pattern rather than altering a pre-existing jacket. The main reason I recommend that is because of the way his jacket closes, in that it doesn't. Jackets are made to close in the front either with clips, buckles, buttons, or even velcro but clearly his jacket has no such pieces.
Jacket patterns are usually split into 4 pieces: Front left, back left, front right, and back right (Sometimes three in which case the back sections are combined into one piece). Measure from the center of your chest back about 2-4 inches (depending on your size) and subtract that from how much the pattern suggests using. And also remember to compensate for the flaring towards the bottom of his jacket. Just gradually increase your measurements towards the base of the jacket.
The belts, use a black faux leather or some kind of vinyl. The buckle you could make with wood, clay/sculpey, or if you have two matching belt buckles that size then that's even more awesome. Same goes for the metal plates on his jacket (Though personally when I do decide to make Ragna I would just use little strips of aluminum sheeting). Or a little bit of cardboard with a few pieces of aluminum tape would also be pretty good.
Hakama is pretty straight forward. And luckily his aren't pleated so you'll get to skip the hardest part, in my opinion, of Hakama making. The real hard part I think... The boots. The only thing I can think of doing is buying a pair of boots with a small heel and painting/dying them red and then using a little bit of sculpting material to make the little plate on the tips.
The gun/sword looks like a lot of fun to make, I'll bet when Fev sees it (saw it?) she'll be anxious to have someone commission her to make it (But don't quote me on that!). Wood workers dream prop.