“How do you dress as a liberal? Wear Birkenstocks and don’t shower?”
Well that or cross dress.
Don’t forget the cardboard cutout to put over your car of a dented unwashed Volvo nearly covered in liberal bumper stickers.
http://www.buycostumes.com/Illegal-Alien-Adult-Costume/60504/ProductDetail.aspx#
guaranteed to drive moonbats batty!