Once you reach your 30s, your wardrobe will need to mature with you. That slinky spaghetti strap dress that worked for you when you were busy clubbing in your 20s, the glitter liner, the rainbow makeup—they just wouldn't make sense anymore.

Your 30s is also when you'll be attending a lot (A LOT) of weddings, conferences, and other black-tie events—you'll need to invest in certain pieces of clothing to follow stricter dress codes. A bonus: This means you're financially capable of splurging on yourself. Price tags won't be an issue because you believe in the cost-per-wear strategy. You're willing to shell out extra cash because buying a genuine leather bag is considered a fashion investment.

If you're nearing the 30-year mark, visit your closet and check if you've already got the essentials by flipping through the gallery below.