Did you dress grunge for your job interviews? Or did you do what every grunger in my law school class did when going out job hunting - get a haircut and a suit?
By the time I started job hunting, the grunge era was over. I got a suit of course, because a job is like being invited to someone else's party; they get to set the dress code. But my ex - and brother in law - who both worked as highly specialised programmers, did hang on to their ratty t-shirts. My ex always said people wouldn't think he was any good at what he did if he didn't. Computeer geeks and all, you know. So I suppose they had a dress code of another sort!
There's nothing wrong with adaptability. Only a very rude person behaves like the world is their party. But no one dress code fits all events!
And no one should ever wear flannel shirts and long unkempt hair. I have no excuse except that I was young! Luckily, time has fixed that for me!