What does "buy one get one free" mean in clothing sales? How to send it?

First, clothing sales, buy one get one free, is a promotion method, aiming at promoting better sales of clothing products.

Second, buy one get one free. In reality, there are the following operation modes: 1, buy one more piece of clothing and get one more piece of the same paragraph; 2, buy a dress, and then send a belt, socks, scarves or other clothes, such as buying a coat, sending pants and so on; Third, buy a dress and send it to other services, such as meal coupons.