Thank you much. I'm more overweight than Francis is, and I wasn't willing to shave my hair and cut a lambda into it. Also, and I didn't have them in that picture, I found black leather driving gloves. Completed the costume.
You could get around keeping your hair by saying you're a younger version of Francis.
Your Francis costume is much better than the one that dude with the glasses had (I am referring to the L4D cosplay images you linked me to)
First, here is my friend Raych as a Hunter:
Her costume is so good, I had to stick a link here.
And here's my Zoey cosplay:
I was supposed to look all aggressive and serious, but it's hard to keep a straight face when Medusa is taking your photo with the Joker and a Hunter stood next to her.