Regardless, if you happen to be heading to a theme party in the coming weeks—particularly those surrounding a decade-specific dress code—you’ll want to know exactly what to wear to channel the ’90s for the night. Luckily, considering the trends on the market, getting dressed for a ’90s theme is easier than you might think. A classic 90s outfit consists of a cardigan and high-waist jeans. Choose a cardigan in a pastel shade or a more dark color for a grunge vibe. You can button it up or leave it. High-waist jeans are versatile and can be worn casually or dressed up. Pair this combo with sneakers or boots and a fashionable belt to complete the look. 55ao.