1. No denim-on-denim. Like a jean jacket with jeans on . . . a.k.a., the Canadian Tuxedo. Lots of people do it now, so it’s not as weird anymore.
2. Your shoes, belt, and socks all have to match. You might still want to avoid mixing blacks and browns. But colorful socks and belts are cool now too.
3. No socks with sandals. Enough people have embraced the “Sad Dad” no-style trend, which values comfort over fashion. So do what you want.
4. Mixing prints, like stripes and dots. Don’t fully ignore that one, because it’s hard to pull off. But more and more high-end designers have been mixing them.
5. No hats indoors. No one cares anymore except your grandparents. So unless you’re over at their house, don’t worry about it.