Red paired with a red short-sleeve

Quick answer：

This refers to a fashion style where red is used in a combination with another red item, typically a short-sleeve shirt. In fashion, the pairing of colors can be used to create various looks and can be influenced by color theory, which is the study of how colors interact and influence the perception of color. When combining two shades of red, it's important to consider the intensity, hue, and saturation to create a harmonious or contrasting look.