Welcome to grown-up life. The last real job I had was suit and tie every day. Casual Friday was once a month and casual meant you didn't have to wear a tie.
Ah, so Dov Charney has exposed *all* his fetishes for the world to see.....I foresee a lot of fapping coming from the executive offices to security camera footage.
Go back 20 years. What were people wearing? Take your style-cues from that.
That's how the retro/vintage cycle has worked for decades now.
Again: Go back 20 years. That's what's hot right now. Want to be really out in front? Go back 18 years. You'll be 2 years ahead of everyone!