Martinis Bistro

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My company is a dinner for the pilots of our company, the invitation says "white black and "wear? So I do not know if that means formal? or Like pants and shirts tie optional? Let's Bistro and Lounge twigs Martini South Hill in Spokane, WA. if that helps (you can find) We are a company uniform and I guess its somewhat formal. Nobody has any idea in my work, hehe. Thus, any suggestions? I wondered if Argyle print sweater / jacket is well worn? Thank you.
check out the comments on the following link. I would say that's definitely not black tie … their peers. just wants to wear black and white for any reason. I go with black pants and white shirt. and not in the sweater
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