In general, your employer can decide what your uniform at work will be. If your uniform is so uncomfortable that it is causing health problems, like a rash, you may be able to get an accommodation like the overweight workers in your workplace. In that case, you should speak with your supervisor and/or your human resources department about an accommodation.
This answer is provided for guidance only. DO NOT rely on it as legal advice. We DO NOT have an attorney-client relationship. You should contact an attorney in your area for a one-on-one consultation before pursuing any action or making any decisions.
Unless it's causing you physical harm, yes, it's legal. Your 'right,' I'm afraid, is the right to find another job.
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