Every five year old can count better than you! 1. Linen is a fiber made from a plant (flax)2. I'd say yes, def. a summer fabric.3. not always. Depends on yarn count & waive & fabric weight5. not sure it is more expensive6. oh yes. Some like it & embrace the wrinkles.7. imho, yes. Others might disagree, but with the wrinkels and slubby texture it is more casual than most cottons imhoI would not suggest to get a linen shirt first, better start with cotton.