I haven't found a decent looking Patty/Liz hat premade yet either, so I would recommend probably making one as well. I used this wonderful tutorial on how to make mine, (http://www.cosplay.com/showthread.php?t=204938
) -- it's easier than it looks and turns out really nice.
As for the wig, you can find a lot of good ones for decent prices on ebay. Just be sure to check out the reviews before buying. =)