Many providers will have wishlists on their website. Many upscale escorts use LuxyList.
Just google LuxyList and the name of the provider and you may find a link. It is convenient since the provider already have given size info for clothing and shoes so you do not have to know it. The gift is shipped to the address given by the provider.
As Nikki Tylor mentioned in her post, providers on Twitter will often show their gifts, sometimes with a thank you note to the client who gave them the gift.
The downside is that LuxyList charges a 15% service charge in addition to a $10 shipping fee, the list price of the gift and sales tax.
If the gift is not available, they will ask the provider to select a replacement gift. The is no way to get any refunds.
I have used it a few times