To provide an electronic mail-order sale system for clothes for a pet, capable of making the custom-made clothes for a pet dog, providing a good product in addition to omission of trouble and a time because a professional seller makes the clothes though it is troublesome because the trouble and the time are required in sewing when measuring a size of the pet dog to make the clothes at home or the like, and obtaining the clothes or the like suitable for a body shape or the like of the pet dog by measuring the size of the pet dog by a properly directed measuring method to transmit it to the seller.

In this electronic mail-order sale system, the seller side and a purchaser side execute a business transaction of the clothes for the pet such as the dog via a communication means such as the Internet. Based on measurement information about the size of a necessary portion such as height or the like of the pet, information about a purchase-desired commodity selected from a design sample image wherein the target pet in the system wears the clothes, and necessary information about the kind, an age and gender or the like of the pet dog, the seller side makes the clothes fit for the information, and delivers the commodity to the purchaser side.