No. In the example at hand, it's the equivalent of the pub owner telling the waitresses he'd gotten a SC licence and if they didn't wear the haltertop and micromini, or serve topless they'd have to find other work. Long ago decided against the owners.and yes, they have the right to leave and find employment elsewhere by their own volition. That's the equivolent of a stripper deciding she didn't want to take her clothes off any longer.
Don't be distracted by fuji pointing out that no one gives up their overall right to a safe workplace by accepting an unsafe condition on some occasion. And remember, no one can legally make accepting an unsafe situation a condition of employment.
Enough of these hypothetical bar examples: Give us something real about people buying into self-endangerment for pay. Tell us how working in a Smokers' Club would like being a trapeze artist, or a movie stuntman.