So I was flirting with this girl at best buy today and the simplest opener dawned on me. I don't know if anyone else has come up with this but it works pretty generically
Compliment them on their shirt, it has to be part of a work uniform
Like - oh I love your shirt, where'd you get it?
It's simple, and it's obviously teasing cuz there's like 5-20 people there wearing the same thing. Then play from there
And it works with anyone in a uniform shirt, preferably where there are many in the same uniform