At the first picture you actually look somewhat like Dorkman from the Ryan vs. Dorkman video.
That's intended to be a compliment by the way. It is not my intention to be mean in any way. Those were some really good videos.
The brown hiking boots somewhat throw it off, however, if you purchase some boot gaiters you can easily cover that up, especially if you don't want to invest in replicated / authentic Jedi leather boots, or other leather apparel that may be expensive, which I do myself personally.
http://workitmom.com/bloggers/affordableluxuries/files/2013/01/gaiters.jpgThese were just pulled up to show an example so the price may vary along with the styles.
I use boot gaiters for my costume as well. I wear black leather slip-on dress shoes which I purchased from Payless Shoestore and I wear calf-length leather gaiters over the shoes which I had custom made for about $60 from some random shopping-mall collectibles store in Moreno Valley, CA called Fireblood Arms I believe.
The gaiters get the job done and look a lot less detailed then these:
http://i00.i.aliimg.com/photo/v0/101061636/Leather_Gaiters.jpgOr these:
http://fc00.deviantart.net/fs70/f/2010/176/0/5/Steampunk_leather_gaiters_2_by_AmbassadorMann.jpgI'm actually surprised leather boot gaiter's haven't been suggested yet on these forums. They are a great alternative to expensive full boot products and they even add a bit of depth to a costume.
They also may suggest that as a Sith you ride a speeder-bike as that is what gaiter's are intended to be used for, riding on motorcycles, animals, or moving through thick brush but wearing a covering so stickers or rocks do not get in your shoe.
Even soldiers in WWII wore gaiters.
Other than that, there are many possibilities you can add.
I like the hoodie underneath the gi. I'll think of that for my own costume.