That shade of green isn’t really workin’ for you [closed]

So I'm reading a book, there's some humour on a page where there's an 'Advice guy' that says things. Here's three of the things he says:

1)"Treat yourself to a cold one! You deserve it!"
That I know refers to beer

2)"Tell your boss the report will have to wait. There’s powder at Aspen!"
I found the meaning of that here

3)"That shade of green isn’t really workin’ for you..."

I don't quite get the third one, what's the play on words here?

Edit: So I did add some context in a comment below but I'm editing this so you have it here as well.
Well, this is from a book on programming using Java(Head First Java). But this particular part is just there to add in some humour. The authors are known to make a lot of remarks which don't necessarily have to do anything with programming directly. The context here is that the advice guy gives you advice when you're having those 'long days of coding' (and possibly need someone to cheer you up, I suppose). These things are usually references to something from the real world or rather just a play on words. Like the second quote, powder on Aspen. That's to say there's fresh snow at the Aspen ski resort thereby hinting at you taking a break and going skiing there. So really, it's either a reference you get, or you don't.. there isn't so much as to the context. That's how the authors wrote the book(The humorous parts I mean, some-people-get-the-joke-some-don't-kind). In this case, I could get the meaning of the first two quotes but couldn't guess at the third one.
Looking at the answers below, it does seem like just a remark at clothing, but I asked for confirmation/possible variation.

Solution 1:

Absent context it's difficult to guess at the intended meaning. Literally, it would mean that you have on an article of clothing which is green in color and that particular shade of green is unflattering.

Slightly less literally, it could suggest that you appear to be "green with envy" (a common idiom), and that the envy is not flattering to you.

More figuratively, it could imply that you are simply being stupid.