When I started in retail, I worked with a wonderful lady who had spent many years working in Kendal Milnes in Manchester - they employed a photographer who would attend local weddings, race meetings and other posh gatherings.
When the well spoken wealthy ladies from certain parts of Cheshire would return all manner of expensive garb (hats being the favourite it seems, easy to hide the label) as not appropriate, then the sales assistant (My lovely Auntie Nellie) would slide a snapshot across the counter - the lady always took the item and said 'please add it to my account.