My daughter recently enrolled with this company, for temp/casual event bar work in Glasgow. To work their events you need a certain type of shirt/blouse, a certain type of trousers (no skirts, now!!) and a certain type of footwear. None of this "uniform" is provided for you.
In return for spending your own money on appropriate clothing and being available at the drop of a hat, you get paid the minimum possible amount that the company can legally pay you.