My son is in Iraq and has asked me to do some shirts for him and some of his men that has their logo on it. I have bought the shirts and they are collar pull-over shirts. How do I measure to put the logo on. He wants it on the left hand side. The neck opening has two buttons and I really want these to look nice. I use a Viking SE for my work and have the logo. Any help would be greatly appreciated. Thanks in advance. Marie