Complaining as an employee

So who do we (the employees) complain about certain things like dress codes, etc? Most things they want us to wear is reasonable for a retail job but the fact that we aren’t allowed to wear pride merch (sold by Michaels) is ridiculous. I don’t think it’s okay to not be allowed to express ourselves more but they want to profit off of us when pride month comes around. I know other stores in other states say their managers don’t care but mine are strict with being exact with following dress code.