Oy vey, I fail at cosplay, but I still want to do Mask de Masque so badly. Anyway, these are the things I'm mostly concerned about.

Where to acquire the following:
-Red boots...Yeah, I think this one explains itself.
-Long green coat
-Red vest

Then how to make
-Those awesome cuffs
-The ruffles

Thanks a lot in advance

First off, do you know how to sew? If not, do you know someone who does sew? There are probably a lot of patterns that could get you the long green coat you're after, as for making the ruffles and the sleeves... I'm no so sure, but it might help to check out these pattern sites:

www.simplicity.com
www.mccallspatterns.com

Both places have sewing patterns you could use.

Do you have any idea how you're going to make the hat and feather?

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You'll need a mask, maybe base the mask off the (Sad & Happy Drama Masks? I don't know what they're called)