Every garment/protector/gloves/boots/shoes in the store (products launched to market after April 2018), which has been CE certified will always have a booklet explaining in which class it has been certified in. There will also be either markings or labels indicating which class of protection it provides and the standard against which it was tested. Care and maintenance instructions will also be provided, among others.
Furthermore, in the booklet, you will find a special website address, on which you can request a so-called DoC; the Declaration of Conformity of the product. This will then be provided to you by mail. If the item you’re looking at is not certified, there is no DoC. Easy, isn’t it? Check out if the product you own is a CE compliant garment.