20s: Your 20s are all about self-discovery and figuring out what exactly your deal is. Are you a free spirit or a hard ass? A party girl or a hermit? Do you want to go to an office that requires a suit or would you rather work all day in your pajamas? Settling into your life requires figuring out the fashion items that will never let you down (even if the other things in your life sometimes do). Quality jeans, your first statement bag, and a necklace you'll wear every single day will be the building blocks of your wardrobe.

A Statement Bag — No matter how much you spend on it, make sure it's something that you can take on interviews and out on the weekends.
Reed Krakoff Leather Tote, $1,190, available at My Theresa.

Everyday Jewelry — Whether it's a simple chain or a ring you'll never take off, invest in a piece of jewelry that won't turn your skin green.
Jennifer Meyer Gold Stick Necklace, $500, available at Barneys.

Designer Jeans — Figure out which brand fits your tush the best. Then, splurge. Trust us, it's worth it.
Marni Mid-Rise Jeans, $340, available at Net-a-Porter.