Res1,2,3のいう常識は知りませんが、
BC州であれば、以下があてはまるのではないでしょうか?
Uniforms and Special Clothing
If an employer requires an employee to wear a uniform or special clothing, the employer must provide, clean and maintain it at no cost to the employee.
Special clothing is clothing that is easily identified with the employer. For example, clothing with a company logo or unique company colours.
Special clothing includes a requirement to wear the garments that the business is currently selling. A dress code (no jeans, no cut-offs, dark clothing, business casual) is not a uniform.
Employers and employees can agree that the employer will reimburse employees for cleaning and maintaining special clothing.
Personal safety equipment required by the Workers’ Compensation Board is not considered special clothing unless the equipment also associates the wearer with the image or identity of the employer.
http://www.labour.gov.bc.ca/esb/esaguide/#7より
カナダ人が怠け者かどうかは別として、自分でEmployment Standardsを調べようともしないのは怠け者かも〜。ある意味Res3は合ってる。
ご自分で該当州のEmployment Standardsを調べることをおすすめします。面倒くさいと思われるのであれば、ドライクリーニング代はだまって払っちゃえ。