Shade & size
White shoes, one shade at a time. Keep ivory, cream and champagne separate, and check the size attached to each retailer price.
Check the selected shade
The option in the listing matters more than the colour in a range photograph. Keep white, ivory and cream separate.
Check the size
Look up the brand’s size guide and the selected size at the retailer. A price for one variant may not apply to another.
Check the date
For an occasion, work back from the day you need the shoes. Allow for delivery, trying them on and any return.