Spaghetti straps are very thin straps worn over the shoulders.
A spaghetti strap is a narrow shoulder strap used to support clothing while leaving most of the shoulder and upper chest uncovered. The term commonly describes straps on camisoles, sundresses, evening gowns, swimwear, crop tops, and some bras. Its resemblance to thin strands of pasta explains the name.
Unlike a halter strap, which usually ties or supports clothing around the neck, a spaghetti strap rests on the shoulders. It is also much narrower than the straps used on many everyday bras or tank tops, so it provides less surface area for support and can be more delicate.
The phrase is a clothing description, not a reference to a specific garment. A dress, top, swimsuit, or undergarment can all have spaghetti straps. Because the straps leave the shoulders visibly bare, schools, workplaces, racecourses, and other venues may restrict them under particular dress codes. “Noodle strap” is another term used for the same basic design.