What approach do you take if a waitress is checking you out at a sports bar? (Whom isn’t assigned to your table)

She’s obviously legal if she working behind a bar, chat / small talk / flirt

Strap on your balls and ask her out

I wouldn't leave a tip and then see if she still checks me out next time. She is probably just looking for a sugar daddy.

One option would be to drop trou...
Not recommended, but certainly an option.

I try a small talk to figure out whether she's worth my time or not

Have you never been to a sports bar?

Legal approach

Wave her over

move to her tables