Really, I didn't address any of your questions? How about #1. What type of shirt? I offered the info the the quality of shirt and I considered that relevant to the type of shirt.
Too many times you find tee shirt companies selling thin cheapo tees. I'm not saying your will be, I'm saying the ones I pointed you to are definitely worth looking into. Again, I've never come across tees this good. That's why I told you about them.
You'd be doing yourself a favor by ordering one and checking it out IMO. But privately, I don't give a rat's ass if you do. I was trying to be helpful.