Evelyne TPMs come as a full set as is. You cannot swap out the strap for your purchase. You also cannot buy an additional leather strap from your SA unless it’s one of the few premade seasonal strap options made in general and they happen to have it in stock. Some people use Etsy to fill this need. (I will note that some more VIP type clients with long standing relationships have been able to separately order leather straps for their Kellys, however I’m not sure that I’ve ever heard of it being successful for an Evelyne.)