"California law allows employers to require employees to wear particular types of clothing or uniforms to work. If an employer requires non-exempt employees to wear a uniform, the employer must pay for and maintain it for the employee.
According to the California Labor Commissioner, the term “uniform” includes any apparel and/or accessories of distinctive design or color. An employer may prescribe the weight, color, quality, texture, style, form, and make of a “uniform” required to be worn by employees. When an employer simply requires employees to wear “basic wardrobe items which are usual and generally usable in the occupation,” the clothing is not a uniform. For example, specifying that employees wear white shirts, dark pants, and black shoes and belts, all of unspecified design, does not constitute a “uniform.” But if a specific color is required then then the employer is required to pay for the uniform."
They can tell you all they want.
They are wrong.