As other posters have said, it will vary. At Next years ago, uniform was NEXT clothing, which you bought and chose yourself, but at a discount. But you could wear it out of work too.
When i was front line staff at my current employer (an airline), the airline gave you a full uniform consisting of a certain number of each things, each with a "life", at the end of the life you could return it and get another one. So the box of tights were every six months, the shirts 1 year, the winter coat 3 years etc.
If you needed a replacement sooner, you wanted extras, or if you lost something, then you had to pay and it came out of your wages.