Frankie, if none of those pan out, try art supply houses. You can get white silk of good quality as the base material for silk screening.

Like these:
http://www.dickblick.com/zz630/00/
The 14x72" scarf is a little over eight bucks; a 35" square is about ten. And they have a variety of dyes- not bright orange, but the magenta should pop out from the background.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.