Well, I gave up on the costume idea and just went for colorful.

Right now the plan is: my pink work polo (has the paper's name on it, figure I might as well get in a plug), bright purple wind pants and purple socks, and bright pink flip-flops (they make you wear some form of shoes). I think I will top it off with my Brewers cap.
It starts at noon and I am scheduled to go at 1:20 -- maybe by then the temp will have risen to above zero.