No, washing clothes in vinegar as a part of the first wash does not typically set the color. In fact, vinegar can be used as a natural fabric softener and can help remove any residue or detergent buildup that might affect the color or texture of the fabric. Vinegar is also known to help prevent color bleeding in new or brightly colored garments.
However, it's important to note that using vinegar alone is not a guaranteed method to set the color. If you're concerned about the color bleeding or fading, it's recommended to follow the care instructions provided by the clothing manufacturer and use a gentle, color-safe detergent specifically designed for the type of fabric you're washing. This will help ensure the longevity of the color and overall quality of the garment.
If you're uncertain about how a particular fabric will react to vinegar or any other washing method, it's always a good idea to test a small, inconspicuous area of the clothing first to see how it responds before proceeding with a full wash.