eiblyn | My Girlfriend's Parents

I've been dating my girlfriend on and off for over a year now. I love her deeply and I intend to stay with her as long as we both are amenable to the idea. She's married to a guy who I think is fabulous and quite fun. He and I have good conversations and I genuinely respect the man. Not to mention the fact that he makes her deliriously happy.
*insert girlfriend's parents*
My girlfriend just came out to her parents recently about dating both of us. I'm fine with that. I really don't mind if the people I date want their parents to know about me. After all, my parents know aboout everyone I date. Today she invited me to go to dinner with them. It was a bit random and out of the blue...but of course I said yes because I know that she really wants her parents to get to know me and to like me. She bribed them by telling them I lived in Germany for seven years (which is true) so they assume I speak German (which is semi-true). But she also told him that I speak a lot of slang so my grammar mistakes won't be as terrible :- (
Anyway, so now I'm trying to determine what to wear to this restaurant so I don't look like a buffoon when most of my good clothes are packed in some form or another. Everyone wish me luck...I think I might need it