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Ruby and Fuchsia

The clothes: So long as each shade is truly a jewel tone, this pairing should work every time; when in doubt, look for pieces in luxury materials, like silk or velvet. Since the colors are already quite regal, fancy fabric will enhance the effect. 

The accessories: I like the way black that makes the crimson/purple combo a little more causal, but any sort of metallic will also work—especially for black-tie occasions. Tans, creams and "nature-y" hues in general, however, should be avoided.

Blush and Fatigue

The clothes: This particular mix is all about juxtaposition, so the girlier the pink and grungier the green, the better. But limit yourself to two major pieces, otherwise the effect is diluted.

The accessories: Clean and crisp black or white, maybe a little bit of understated jewelry. Don't overdo it.

Lemon and Slate

The clothes: Unless you find a really amazing print that incorporates both these two shades, stick to simple shapes in solid colors. Since yellow and grey are already so drastically different, the outfit will look forced if there's too much going on.

The accessories: This is where you get to experiment: try a pattern! Wear a statement necklace! Just be mindful that your bag, jewelry and shoes all work together.

Melon and Lavender

The clothes: The key to making mixed pastels seem more sophisticated than trendy is to create extra contrast between the two hues. Here's how: use one shade for the main outfit (a dress is the easiest way to accomplish this, but a top with white pants would work, too) and save the other for accessories. 

The accessories: Besides a few pieces in your second, non-clothing color, incorporate any variety of silver, gold or peach. Avoid black or brown—either one will look clunky.

Tomato and Aqua

The clothes: Whether it's a cardigan over a dress, a button-down tucked into a fit-and-flare dress or slacks and a sweater, any combination of two pieces will work. The most important thing is that the bold shades balance each other out.

The accessories: Black or white or both—colorless prints help break up all the big areas of brightness.