I would like to order a varsity jacket but don't understand the sizing chart. I thought I'd be a large but I don't know how to measure 25-26 ... what? How do I measure 1 inch below my armhole when laid flat? What does that mean? If someone has one of these, can you shed some light. I tried emailing the merch address for questions but there has been no response so I thought I'd try here. Thanks!