Onion color is a soft shade of brown with a yellowish undertone. Depending on the particular shade of onion color, there are a number of colors that can match or complement it.

Here are a few color suggestions to consider:

1. White: One of the simplest color choices to pair with onion color is white. A crisp, clean white shade will contrast nicely with the softness of onion color, creating a fresh and modern look. You could try pairing an onion-colored top with white jeans or a white skirt for a stylish and chic outfit.
2. Olive Green: Another great color to pair with onion color is olive green. This earthy shade complements the yellow undertones in onion color, creating a warm and natural look. Try pairing an onion-colored blouse with olive green pants or a skirt for a casual and comfortable outfit.
3. Rust: Rust is a rich, warm color that pairs well with onion color. It has a similar tone to onion color, but is a bit more intense, creating a bold and eye-catching look. Consider pairing an onion-colored top with rust-colored pants or a skirt for a unique and stylish outfit.
4. Navy Blue: Navy blue is a classic color that goes well with a variety of shades, including onion color. The deep blue hue creates a nice contrast with the softness of onion color, making for a sophisticated and elegant look. You could try pairing an onion-colored dress with navy blue shoes and accessories for a refined and polished outfit.
5. Mustard: Mustard is another color that pairs well with onion color. This vibrant yellow shade is similar to the yellow undertones in onion color, creating a cohesive and harmonious look. Consider pairing an onion-colored top with mustard-colored pants or a skirt for a fun and playful outfit.
6. Tan: Tan is a neutral color that pairs well with onion color. It has a similar earthy tone to onion color, creating a natural and warm look. Try pairing an onion-colored top with tan pants or a skirt for a timeless and effortless outfit.

In general, when trying to match or complement onion color, it's important to choose colors that are either in the same color family or have similar undertones. This will help create a cohesive and harmonious look that is both stylish and sophisticated. Additionally, consider the occasion and the look you're trying to achieve when choosing colors to pair with onion color.