[geofft]

It is certainly a sign of being liberal that one is allowed to wear whatever they like for any reason, and the state does not say, "Your religion is bad and you are oppressing yourself, and we are here to rescue you."

There have of course been illiberal but left-wing states that are willing to say exactly that. Most Communist governments have banned religion of any form on the grounds that the state knows better, but I don't think those governments are usually called "liberal."