Well, Theres no stopping anyone from doing Fett. If your worried about being my hieght, but skinny, I'd say get bigger. I may be tall like you, but I'm physically proportionate, Im not fat either (Well, I can still lose some weight). My only suggestion is since you have the potentional to be as big, or even bigger then me, you could start working out, or weight training. Then you can find that you'll eventually get bigger through muscle mass. Other then that, start eating your wheaties.....
Now, if you dont want to essentilally get "bigger," you can just take al the parts of the suit, and cut them down, or resize them to your proportions. I know as well as you do, finding ANYTHING (especially pants and shoes) that fits perfectly is almost impossible. fortubatly, my jango helmet is large enough, and it appears proportionate to me.
Like I said, you can just adjust the suit to fit you, or if you want to take it a step further, even make yourself bigger (not fat no lol). Ive never been skinny, well I was when I was like 6, but since then, ive been taller then all my teachers. Goodluck with your suit.
-tubachris