As I walked around the city on Saturday, I witnessed a lot of bad fashion. (Thanks, Erin Express.) Bad green t-shirts. Bad green knee socks. Bad green shamrock headbands. Bad green makeup. It’s safe to say that it’s easy to do green very, very wrong on St. Patty’s Day. I get it: You don’t want to wear satin Marc by Marc Jacobs kicks when you’ll most likely be standing in puddles of beer (and puke). But you also don’t want to wear any of this. Here’s how to the holiday right. (First, though, start by avoiding the Erin Express.) Otswald Helgason dress, $990 at Browns Fashion; Natasha Couture iPhone 5 case, $48 at Nordstrom; Marc by Marc Jacobs satin Mylo sneakers, $215 at Stylebop; Holly Ryan ring, $265 at The Grand Social.