There's really only two colors the shirt can be, yellow and red, because the actual shirt has to be one of the colors on the logo. Red and yellow are the only two colors in the picture that are set far away from the outside of the logo.
Don't know if you follow that or not, but it makes sense to me... ;)
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Matt Lynch
Co-Webmaster, Kennywood Boulevard
http://kennywood.coasterbuzz.com