50 isn't going to be a good look I don't think, especially if you'll ever wear more than a T-shirt underneath it. I think you usually buy slightly bigger than I do for most NMWA products and I have a sz 50 5-zip (although it's from a few seasons ago).
Sort of? It's not "wrong", but it does cost the first SA. You can ask for a business card and then call it in. I try to do this if it's something I'm seriously considering buying and just need some time to think about.