I'd quote you, but there isn't enough room on the forum (heh)

all joking aside, I did something similar with my employer.

I asked my direct magement if kilts were accepted at work, and got no response. Being a global company, I didn't think it would be a problem. THen again, being a company that is known for lay-offs, I figured I'd ask. I posed the question to the sender of one of those "donate $1 to united way and you can wear jeans" e-mails (oh, I work for a VERY large global computer services outsourcing company).
Three days after I sent the email, I recieved an e-mail from the original recipeint's boss, quoting the dress code. OF course, the dress code makes no mention of kilts or anything like it. I responded quickly, stating I knew the dress code. I commented that it made no mention of kilts, and went on a poetic tear about how the company espouses multi-culturalism and diversity, and other such mangerial buzzwords. Based on these goals of the company, I stated that I figured it would not be a problem, but I would ask first.
A week later I recieved an e-mail from the global executive vice president of human resources. It was possibly the most well-written e-mail I had read in a long time, but it said nothing more that "we know everything you said is true, but we aren't going to say yes or no. There are appropriate times for everything and we are sure we can accomodate your needs. But first, ask you boss."

I asked my boss later that day, she said no.

Good thing is, I've got my own company started, and hopefully won't be working for anyone else before too long.

After all that, I say stick to you guns, as long as you don't get fired ( unless you want to be). I am sure that the ACLU and an army of people will be behind you if something does happen, so it is completly up to you.

Good luck!