Best way to ask my waitress to get to know her outside of her job so I can ask her to be my girlfriend?

Local pub has topless waitresses. I get along really well with one of them and want to date her, but I feel it would be tacky to ask her out while she is working. She is really nice, we get along well amd we usually chat if there is not many other customers she has to serve.

Best way to ask my waitress to get to know her outside of her job so I can ask her to be my girlfriend?
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