So, I think skin paint/white makeup stuff is probably a must...
Not sure what the best product is, what type. Latex-type might look best, but sounds like a pain to deal with. A spray or something sounds like something to look into.
Blue eyes would be nice... Contacts with a robotic look would be cool...
http://www.youknowit.com/online-shop/special-fx-contact-lenses.cfm
(Looks cool! xD)
Mmm, the hat is essential, but I haven't seen many great ones. That white plate looks metal to me.
Something like this might be good if you can find it in red..?
http://www.alibaba.com/product-detail/China-manufacturer-custom-wholesale-metal-plate_1531205414.html
This one would be okay maybe if you could choose the message you wanted...
http://www.dhgate.com/store/product/baseball-cap-korean-version-of-the-sheet/216342676.html#sc1-16-1|1319109366
Or worst case maybe something like this
http://www.alibaba.com/product-detail/fashion-design-flat-brim-snapback-caps_160749707.html
The headphones might be a challenge...
https://etccreative.files.wordpress.com/2013/04/beat_etc.jpg
Beat's might be good, but then how do you change it, while keeping it wearable, and have the pointy antenneas...
Don't see a perfect solution... but this point is probably critical to seperate Quote from costume cosplay and authentic Quote.
Something like this might not be a bad idea... MAybe. or maybe not lol
https://diygeekery.files.wordpress.com/2014/10/robot-arm-2.jpg
Shoes... something like this?
http://www.sportsmansguide.com/product/index/mens-cat-ergo-flexguard-steel-toe-work-boots-black?a=716450
Belt... something like this?
http://www.onpointsupply.com/cart.php?target=product&product_id=84826
Pants... something like this?
http://www.skis.com/...default,pd.html
or maybe that's way too hot and probably baggy
http://www.legionsafety.com/dickies-clothing-wp803-slim-skinny-fit-twill-work-pant.html
Shirt...?
http://www.army-star.eu/id-working-singlet-sleeveless-t-shirt-black-4291
Scarf...
http://zeenews.india.com/entertainment/glamtalk/sport-belted-scarf-look-in-style_1511036.html
Gloves...
http://www.securityprousa.com/sesusehaknta.html
Then if you could rent a good gun prop...
http://johnsonarmsprops.com/wp-content/uploads/2011/02/IMG_0961.jpg
or something like these and you'd be SET!
Though, you probably should have a professional help out. Getting nice shiny good stuff is nice and all, but Quote probably has a certain worn look with all that action. He's a robot who has been through countless battles after all...