綠色拉鍊背心

係我個人頁面同時買兩件以上減$10 同時買3件減$20（如此類推） （即係2件起，每多買一件可以減$10） if you buy 2clothes there will be a $10 discount 3clothes will be $20 discount 4clothes will be $30 discount 5clothes will be $40 discount （which means you will get $10 off for every additional item you buy） （you can go to my page and see ）